Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
Area code 858 prefixes
564 of the 786 possible NXX blocks are assigned in area code 858 (71.8% of capacity), spread across 19 rate centers and 40 holders. The largest holders are PACIFIC BELL (151 blocks, 26.8%), NEW CINGULAR WIRELESS PCS, LLC (50 blocks, 8.9%), T-MOBILE USA, INC. (44 blocks, 7.8%). Grouped by brand, AT&T accounts for 235 blocks; brand-attributable holders cover 87% of the code, and the rest are CLECs, VoIP wholesalers and regional carriers that trade under their own names. The assignment records here run from 2001-02-15 to 2026-10-28, with 32 blocks handed out in 2021 alone. 420 blocks (74%) are in thousands-block pooling, meaning the block is shared between carriers in 1,000-number lots rather than held whole – which is why a single NXX can serve several carriers at once. 4 assigned blocks (468, 469, 473, 475) are not yet in service: assigned to a carrier but not open for calls, so a caller ID from one is spoofed. 209 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.
564 assigned blocks of 786
19 rate centers
40 holders of record
74% in thousands-block pooling
Largest holders in 858
| Holder of record, as NANPA names it | Brand | Blocks | Share |
|---|---|---|---|
| PACIFIC BELL | AT&T | 151 | 26.8% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 50 | 8.9% |
| T-MOBILE USA, INC. | T-Mobile | 44 | 7.8% |
| ONVOY, LLC - CA | Onvoy | 35 | 6.2% |
| FRACTEL, LLC | – | 35 | 6.2% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | Verizon | 32 | 5.7% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Verizon | 31 | 5.5% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | AT&T | 26 | 4.6% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | TPx | 24 | 4.3% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | Lumen | 20 | 3.5% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 18 | 3.2% |
| COMCAST PHONE OF CALIFORNIA, LLC | Comcast | 15 | 2.7% |
Names are printed as they appear in the assignment records, which is the legal entity rather than the brand. Holding a block is not the same as serving the numbers in it: portability moves numbers between carriers and pooling splits a block between several.
Rate centers with their own page
Rate centers where at least three blocks are assigned, excluding the numbered metro zone codes. The remainder are in the full table below.
All 564 assigned blocks
One row per NXX. “Pooled” means carriers draw 1,000-number lots from the block rather than holding all 10,000, so a pooled prefix can belong to several carriers at once. “Not in service” means assigned but not yet open for calls – a caller ID from one of those is necessarily spoofed. The holder column gives the brand where the legal entity maps to one; the full legal names are in the holders table above, exactly as NANPA records them.
| Prefix | Holder of record | Rate center | Assigned | Pooled | In service |
|---|---|---|---|---|---|
| 858-200 | TPx | LA JOLLA | – | yes | yes |
| 858-201 | Lumen | SNDG MRMS | – | yes | yes |
| 858-202 | AT&T | LA JOLLA | – | yes | yes |
| 858-203 | Onvoy | LA JOLLA | 2016-01-27 | yes | yes |
| 858-204 | Verizon | POWAY | – | – | yes |
| 858-205 | T-Mobile | DEL MAR | 2002-01-16 | yes | yes |
| 858-206 | Onvoy | POWAY | 2006-11-21 | yes | yes |
| 858-207 | AT&T | RNCHOBRNDO | – | yes | yes |
| 858-208 | AT&T | POWAY | – | yes | yes |
| 858-209 | T-Mobile | DEL MAR | 2017-05-22 | yes | yes |
| 858-210 | Verizon | LA JOLLA | 2008-07-21 | yes | yes |
| 858-212 | T-Mobile | POWAY | – | yes | yes |
| 858-213 | T-Mobile | POWAY | – | yes | yes |
| 858-214 | T-Mobile | LA JOLLA | 2017-11-22 | yes | yes |
| 858-215 | AT&T | RNCHOPNQTS | 2007-03-30 | yes | yes |
| 858-216 | TPx | RNCHOPNQTS | – | yes | yes |
| 858-217 | TPx | RNCHOBRNDO | – | yes | yes |
| 858-218 | TPx | POWAY | – | yes | yes |
| 858-219 | American Messaging | SNDG LVTA | – | – | yes |
| 858-220 | T-Mobile | LA JOLLA | 2002-01-18 | yes | yes |
| 858-221 | Onvoy | SNDG LVTA | – | yes | yes |
| 858-222 | Onvoy | LA JOLLA | 2008-10-13 | yes | yes |
| 858-223 | Onvoy | SNDG LVTA | 2013-06-10 | yes | yes |
| 858-224 | Onvoy | LA JOLLA | – | yes | yes |
| 858-225 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | SNDG MRMS | – | yes | yes |
| 858-226 | Verizon | SNDG MRMS | 2014-09-09 | yes | yes |
| 858-227 | Verizon | RNCHOSANFE | – | yes | yes |
| 858-228 | Verizon | LA JOLLA | – | yes | yes |
| 858-229 | Verizon | SNDG MRMS | 2001-09-13 | – | yes |
| 858-230 | AT&T | LA JOLLA | 2011-08-23 | yes | yes |
| 858-231 | T-Mobile | POWAY | 2001-12-14 | – | yes |
| 858-232 | AT&T | LA JOLLA | – | – | yes |
| 858-233 | NORTH COUNTY COMMUNICATION CORPORATION - CA | LA JOLLA | – | – | yes |
| 858-234 | NORTH COUNTY COMMUNICATION CORPORATION - CA | RNCHOBRNDO | – | – | yes |
| 858-235 | Windstream | LA JOLLA | 2019-12-23 | yes | yes |
| 858-236 | NORTH COUNTY COMMUNICATION CORPORATION - CA | POWAY | – | – | yes |
| 858-237 | NORTH COUNTY COMMUNICATION CORPORATION - CA | SNDG MRMS | – | – | yes |
| 858-238 | AT&T | EL CAJON | 2020-09-08 | yes | yes |
| 858-239 | Onvoy | SNDG MRMS | 2014-12-05 | yes | yes |
| 858-240 | Lumen | RNCHOPNQTS | – | yes | yes |
| 858-241 | T-Mobile | LA JOLLA | 2021-01-08 | yes | yes |
| 858-242 | AT&T | LA JOLLA | 2011-06-20 | yes | yes |
| 858-243 | Verizon | POWAY | 2001-05-17 | yes | yes |
| 858-244 | Verizon | SNDG LVTA | – | yes | yes |
| 858-245 | Verizon | LA JOLLA | 2001-09-17 | – | yes |
| 858-246 | Lumen | LA JOLLA | 2007-07-03 | yes | yes |
| 858-247 | TERRA NOVA TELECOM INC. | LA JOLLA | – | yes | yes |
| 858-248 | Verizon | POWAY | 2001-10-18 | yes | yes |
| 858-249 | AT&T | LA JOLLA | 2012-10-04 | yes | yes |
| 858-250 | WIDE VOICE, LLC - CA | LA JOLLA | – | yes | yes |
| 858-251 | Peerless | LA JOLLA | 2012-06-29 | yes | yes |
| 858-252 | T-Mobile | DEL MAR | 2014-10-08 | yes | yes |
| 858-253 | Verizon | SNDG MRMS | 2015-02-16 | yes | yes |
| 858-254 | T-Mobile | POWAY | – | yes | yes |
| 858-255 | AT&T | LA JOLLA | 2011-02-02 | yes | yes |
| 858-256 | Comcast | SNDG LVTA | – | yes | yes |
| 858-257 | Lumen | LA JOLLA | 2014-10-01 | yes | yes |
| 858-258 | Lumen | SNDG MRMS | 2018-06-07 | yes | yes |
| 858-259 | AT&T | DEL MAR | – | – | yes |
| 858-260 | T-Mobile | LA JOLLA | 2013-07-22 | yes | yes |
| 858-261 | T-Mobile | DEL MAR | 2015-02-18 | yes | yes |
| 858-262 | T-Mobile | SNDG LVTA | 2015-03-11 | yes | yes |
| 858-263 | Charter | LA JOLLA | 2013-03-12 | yes | yes |
| 858-264 | Onvoy | SNDG LVTA | 2014-11-24 | yes | yes |
| 858-265 | AT&T | SNDG MRMS | 2015-07-02 | yes | yes |
| 858-266 | AT&T | SNDG LVTA | 2013-11-08 | yes | yes |
| 858-267 | T-Mobile | SNDG MRMS | 2015-09-25 | yes | yes |
| 858-268 | AT&T | SNDG LVTA | – | – | yes |
| 858-269 | AT&T | POWAY | 2018-10-03 | yes | yes |
| 858-270 | AT&T | LA JOLLA | – | – | yes |
| 858-271 | AT&T | SNDG MRMS | – | yes | yes |
| 858-272 | AT&T | LA JOLLA | – | – | yes |
| 858-273 | AT&T | LA JOLLA | – | – | yes |
| 858-274 | AT&T | LA JOLLA | – | – | yes |
| 858-275 | Verizon | SNDG MRMS | 2014-04-08 | yes | yes |
| 858-276 | AT&T | SNDG LVTA | 2016-02-26 | yes | yes |
| 858-277 | AT&T | SNDG LVTA | – | – | yes |
| 858-278 | AT&T | SNDG LVTA | – | – | yes |
| 858-279 | AT&T | SNDG LVTA | – | – | yes |
| 858-280 | AT&T | DEL MAR | 2016-08-08 | yes | yes |
| 858-281 | Lumen | LA JOLLA | 2014-04-22 | yes | yes |
| 858-282 | AT&T | SNDG MRMS | 2017-04-14 | yes | yes |
| 858-283 | Onvoy | LA JOLLA | 2016-10-10 | yes | yes |
| 858-284 | Bandwidth | DEL MAR | 2014-05-15 | yes | yes |
| 858-285 | Comcast | SNDG LVTA | – | yes | yes |
| 858-286 | Vonage | CHULAVISTA | 2018-11-26 | yes | yes |
| 858-287 | Verizon | SNDG MRMS | 2014-08-11 | yes | yes |
| 858-288 | Verizon | SNDG MRMS | 2019-01-22 | yes | yes |
| 858-289 | AT&T | SNDG LVTA | 2020-05-13 | yes | yes |
| 858-290 | T-Mobile | DEL MAR | 2019-02-28 | yes | yes |
| 858-291 | AT&T | LA JOLLA | 2014-09-03 | yes | yes |
| 858-292 | AT&T | SNDG LVTA | – | – | yes |
| 858-293 | TPx | SNDG MRMS | 2019-05-16 | yes | yes |
| 858-294 | Bandwidth | CHULAVISTA | 2019-07-23 | yes | yes |
| 858-295 | AT&T | LA JOLLA | 2014-10-03 | yes | yes |
| 858-296 | Comcast | SNDG LVTA | – | yes | yes |
| 858-297 | NORTH COUNTY COMMUNICATION CORPORATION - CA | DEL MAR | – | – | yes |
| 858-298 | AT&T | SNDG LVTA | 2020-02-04 | yes | yes |
| 858-299 | Comcast | DEL MAR | – | yes | yes |
| 858-300 | TPx | SNDG LVTA | – | yes | yes |
| 858-301 | Vonage | EL CAJON | 2020-06-11 | yes | yes |
| 858-302 | Comcast | SNDG LVTA | 2017-10-03 | yes | yes |
| 858-303 | Comcast | LA JOLLA | – | yes | yes |
| 858-304 | AT&T | RNCHOBRNDO | – | yes | yes |
| 858-305 | T-Mobile | SNDG MRMS | 2021-02-17 | yes | yes |
| 858-306 | Telnyx | DEL MAR | – | yes | yes |
| 858-307 | AT&T | SNDG MRMS | 2017-11-22 | yes | yes |
| 858-308 | T-Mobile | SNDG LVTA | 2021-03-10 | yes | yes |
| 858-309 | Lumen | SNDG LVTA | – | yes | yes |
| 858-310 | Twilio | RNCHOSANFE | – | yes | yes |
| 858-312 | Comcast | RNCHOBRNDO | – | yes | yes |
| 858-313 | T-Mobile | DEL MAR | 2021-03-11 | yes | yes |
| 858-314 | AT&T | DEL MAR | – | yes | yes |
| 858-315 | AT&T | CHULAVISTA | 2021-07-01 | yes | yes |
| 858-316 | AT&T | CHULAVISTA | 2021-07-01 | yes | yes |
| 858-317 | COMMIO, LLC | DULZURA | 2023-08-10 | yes | yes |
| 858-318 | TPx | CHULAVISTA | 2022-05-27 | yes | yes |
| 858-319 | T-Mobile | LA JOLLA | 2021-03-24 | yes | yes |
| 858-320 | AT&T | LA JOLLA | – | – | yes |
| 858-321 | Windstream | SNDG SNDG | 2022-06-30 | yes | yes |
| 858-322 | Verizon | SNDG MRMS | 2015-11-13 | yes | yes |
| 858-323 | Lumen | CHULAVISTA | 2021-07-22 | yes | yes |
| 858-324 | AT&T | RNCHOPNQTS | – | yes | yes |
| 858-325 | Charter | SNDG LVTA | 2021-10-11 | yes | yes |
| 858-326 | Bandwidth | CHULAVISTA | 2022-10-04 | yes | yes |
| 858-327 | NUSO, LLC | SNDG SNDG | – | yes | yes |
| 858-328 | AT&T | LA MESA | 2021-10-26 | yes | yes |
| 858-329 | Bandwidth | SNDG MRMS | 2016-06-14 | yes | yes |
| 858-330 | T-Mobile | RNCHOPNQTS | 2021-11-18 | yes | yes |
| 858-331 | Verizon | CHULAVISTA | 2022-10-10 | yes | yes |
| 858-332 | Lumen | LA JOLLA | – | yes | yes |
| 858-333 | Bandwidth | LA JOLLA | – | yes | yes |
| 858-334 | AT&T | LA JOLLA | 2001-02-15 | yes | yes |
| 858-335 | AT&T | POWAY | – | – | yes |
| 858-336 | AT&T | LA JOLLA | – | – | yes |
| 858-337 | AT&T | LA JOLLA | – | – | yes |
| 858-338 | Onvoy | HARBSNALPN | 2022-09-08 | yes | yes |
| 858-339 | Verizon | EL CAJON | 2022-11-04 | yes | yes |
| 858-340 | AT&T | LA JOLLA | 2023-03-10 | yes | yes |
| 858-341 | T-Mobile | CHULAVISTA | 2022-10-28 | yes | yes |
| 858-342 | AT&T | DEL MAR | – | – | yes |
| 858-343 | AT&T | LA JOLLA | 2022-12-06 | yes | yes |
| 858-344 | AT&T | LA JOLLA | 2001-04-24 | – | yes |
| 858-345 | Comcast | DEL MAR | – | yes | yes |
| 858-346 | Lumen | LA JOLLA | – | yes | yes |
| 858-347 | Spok | DEL MAR | – | – | yes |
| 858-348 | Verizon | SNDG MRMS | – | yes | yes |
| 858-349 | AT&T | LA JOLLA | – | – | yes |
| 858-350 | AT&T | DEL MAR | – | – | yes |
| 858-351 | HD CARRIER LLC | SNDG SNDG | 2022-10-20 | yes | yes |
| 858-352 | Verizon | LA JOLLA | – | yes | yes |
| 858-353 | AT&T | DEL MAR | – | yes | yes |
| 858-354 | Verizon | LA JOLLA | – | – | yes |
| 858-355 | FRACTEL, LLC | SNDG SNDG | 2021-09-22 | yes | yes |
| 858-356 | TPx | DEL MAR | – | yes | yes |
| 858-357 | Lumen | SNDG MRMS | – | yes | yes |
| 858-358 | Onvoy | EL CAJON | 2020-11-06 | yes | yes |
| 858-359 | American Messaging | LA JOLLA | – | – | yes |
| 858-360 | AT&T | RNCHOPNQTS | – | yes | yes |
| 858-361 | AT&T | LA JOLLA | – | – | yes |
| 858-362 | Verizon | LA JOLLA | – | – | yes |
| 858-363 | COMMIO, LLC | JACUMBA | 2022-11-03 | yes | yes |
| 858-364 | NORTH COUNTY COMMUNICATION CORPORATION - CA | RNCHOPNQTS | – | – | yes |
| 858-365 | Onvoy | RNCHOPNQTS | – | yes | yes |
| 858-366 | Verizon | LA JOLLA | – | yes | yes |
| 858-367 | IP HORIZON LLC | RNCHOSANFE | – | yes | yes |
| 858-368 | IP HORIZON LLC | SNDG MRMS | – | yes | yes |
| 858-369 | AT&T | DEL MAR | – | yes | yes |
| 858-370 | AT&T | LA JOLLA | 2023-05-03 | yes | yes |
| 858-371 | Comcast | RNCHOPNQTS | – | yes | yes |
| 858-372 | AT&T | LA JOLLA | 2023-05-03 | yes | yes |
| 858-373 | Verizon | LA JOLLA | – | yes | yes |
| 858-374 | AT&T | LA JOLLA | 2023-08-03 | yes | yes |
| 858-375 | Lumen | POWAY | – | yes | yes |
| 858-376 | TPx | RNCHOBRNDO | – | yes | yes |
| 858-377 | FRACTEL, LLC | POWAY | 2021-07-13 | yes | yes |
| 858-378 | Verizon | SNDG MRMS | 2014-11-14 | yes | yes |
| 858-379 | Bandwidth | EL CAJON | 2022-07-21 | yes | yes |
| 858-380 | Lumen | SNDG LVTA | – | yes | yes |
| 858-381 | AT&T | RNCHOSANFE | – | yes | yes |
| 858-382 | AT&T | POWAY | – | – | yes |
| 858-383 | AT&T | SNDG SNDG | 2023-08-22 | yes | yes |
| 858-384 | WAVENATION, LLC | SNDG LVTA | – | yes | yes |
| 858-385 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-386 | Lumen | POWAY | – | yes | yes |
| 858-387 | Onvoy | LA MESA | 2023-10-02 | yes | yes |
| 858-388 | FRACTEL, LLC | EL CAJON | 2019-03-19 | yes | yes |
| 858-389 | T-Mobile | CHULAVISTA | 2023-10-10 | yes | yes |
| 858-390 | AT&T | LA JOLLA | 2023-11-16 | yes | yes |
| 858-391 | AT&T | POWAY | – | yes | yes |
| 858-392 | COMMIO, LLC | SNDG LVTA | 2024-01-02 | yes | yes |
| 858-393 | COMMIO, LLC | DEL MAR | 2024-01-02 | yes | yes |
| 858-394 | FIVE9, INC. | SNDG LVTA | 2024-01-10 | yes | yes |
| 858-395 | Verizon | POWAY | – | – | yes |
| 858-396 | AT&T | LA JOLLA | 2024-01-22 | yes | yes |
| 858-397 | Comcast | SNDG MRMS | – | yes | yes |
| 858-398 | Onvoy | SNDG MRMS | 2023-01-20 | yes | yes |
| 858-399 | FRACTEL, LLC | CORONADO | 2021-01-27 | yes | yes |
| 858-400 | TPx | RNCHOSANFE | – | yes | yes |
| 858-401 | AT&T | LA JOLLA | 2004-03-08 | yes | yes |
| 858-402 | AT&T | LA JOLLA | 2024-02-20 | yes | yes |
| 858-403 | AT&T | POWAY | 2024-06-17 | yes | yes |
| 858-404 | AT&T | LA JOLLA | – | yes | yes |
| 858-405 | T-Mobile | LA JOLLA | 2001-12-14 | – | yes |
| 858-406 | AT&T | LA JOLLA | 2024-07-23 | yes | yes |
| 858-407 | T-Mobile | CHULAVISTA | 2024-08-30 | yes | yes |
| 858-408 | Verizon | SNDG MRMS | – | yes | yes |
| 858-409 | AT&T | LA JOLLA | 2024-09-17 | yes | yes |
| 858-410 | Verizon | LA JOLLA | – | – | yes |
| 858-412 | Charter | LA JOLLA | 2006-09-22 | yes | yes |
| 858-413 | TPx | POWAY | – | yes | yes |
| 858-414 | Verizon | SNDG MRMS | 2002-05-17 | – | yes |
| 858-415 | T-Mobile | SNDG SNDG | 2024-09-19 | yes | yes |
| 858-416 | AT&T | LA MESA | 2024-10-24 | yes | yes |
| 858-417 | AT&T | NATIONALCY | 2024-11-12 | yes | yes |
| 858-418 | AT&T | SNDG SNDG | 2024-11-13 | yes | yes |
| 858-419 | NUSO, LLC | SNDG SNDG | 2024-11-13 | yes | yes |
| 858-420 | AT&T | SNDG LVTA | 2024-11-21 | yes | yes |
| 858-421 | AT&T | RNCHOBRNDO | 2025-01-13 | yes | yes |
| 858-422 | FRACTEL, LLC | CORONADO | 2021-09-23 | yes | yes |
| 858-423 | Verizon | SNDG SNDG | 2025-01-24 | yes | yes |
| 858-424 | Onvoy | EL CAJON | 2023-03-20 | yes | yes |
| 858-425 | Charter | SNDG SNDG | 2025-01-28 | yes | yes |
| 858-426 | Onvoy | EL CAJON | 2025-04-08 | yes | yes |
| 858-427 | Windstream | SNDG LVTA | – | yes | yes |
| 858-428 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | RNCHOPNQTS | – | yes | yes |
| 858-429 | Lumen | SNDG LVTA | – | yes | yes |
| 858-430 | Verizon | SNDG LVTA | – | yes | yes |
| 858-431 | AT&T | LA JOLLA | – | yes | yes |
| 858-432 | TPx | RNCHOBRNDO | – | yes | yes |
| 858-433 | Windstream | SNDG MRMS | – | yes | yes |
| 858-434 | Verizon | RNCHOPNQTS | – | yes | yes |
| 858-435 | Windstream | POWAY | – | yes | yes |
| 858-436 | TPx | DEL MAR | – | yes | yes |
| 858-437 | AT&T | SNDG MRMS | – | yes | yes |
| 858-438 | Onvoy | CHULAVISTA | 2022-10-06 | yes | yes |
| 858-439 | AT&T | CHULAVISTA | 2025-06-11 | yes | yes |
| 858-440 | AT&T | LA MESA | 2025-08-22 | yes | yes |
| 858-441 | Onvoy | EL CAJON | 2025-10-16 | yes | yes |
| 858-442 | Verizon | POWAY | – | – | yes |
| 858-443 | T-Mobile | CHULAVISTA | 2025-10-21 | yes | yes |
| 858-444 | TPx | SNDG MRMS | – | yes | yes |
| 858-445 | T-Mobile | SNDG MRMS | 2025-11-28 | yes | yes |
| 858-446 | SHELCOMM | SNDG SNDG | 2026-05-13 | – | yes |
| 858-447 | Onvoy | RNCHOPNQTS | 2026-05-21 | yes | yes |
| 858-448 | AT&T | CORONADO | 2026-07-23 | yes | yes |
| 858-449 | Verizon | POWAY | – | – | yes |
| 858-450 | AT&T | LA JOLLA | – | – | yes |
| 858-451 | AT&T | RNCHOBRNDO | – | yes | yes |
| 858-452 | AT&T | LA JOLLA | – | – | yes |
| 858-453 | AT&T | LA JOLLA | – | – | yes |
| 858-454 | AT&T | LA JOLLA | – | – | yes |
| 858-455 | AT&T | LA JOLLA | – | – | yes |
| 858-456 | AT&T | LA JOLLA | – | – | yes |
| 858-457 | AT&T | LA JOLLA | – | – | yes |
| 858-458 | AT&T | LA JOLLA | – | – | yes |
| 858-459 | AT&T | LA JOLLA | – | – | yes |
| 858-460 | Onvoy | EL CAJON | 2026-07-30 | yes | yes |
| 858-461 | Lumen | DEL MAR | 2006-01-06 | yes | yes |
| 858-462 | TON80 COMMUNICATIONS, LLC | NATIONALCY | 2022-01-11 | yes | yes |
| 858-463 | TON80 COMMUNICATIONS, LLC | CHULAVISTA | 2022-01-11 | yes | yes |
| 858-464 | Onvoy | CHULAVISTA | 2026-08-07 | yes | yes |
| 858-465 | Lumen | DEL MAR | 2013-03-29 | yes | yes |
| 858-466 | FRACTEL, LLC | LA MESA | 2021-03-16 | yes | yes |
| 858-467 | AT&T | SNDG LVTA | – | – | yes |
| 858-468 | Onvoy | SNDG MRMS | 2026-08-07 | yes | no |
| 858-469 | Onvoy | HARBSNALPN | 2026-09-14 | yes | no |
| 858-471 | Verizon | SNDG MRMS | 2018-03-06 | yes | yes |
| 858-472 | Verizon | RNCHOBRNDO | 2001-09-13 | yes | yes |
| 858-473 | Comcast | LA JOLLA | 2026-10-20 | yes | no |
| 858-475 | Onvoy | EL CAJON | 2026-10-28 | yes | no |
| 858-477 | FRACTEL, LLC | SNDG SNDG | 2021-06-04 | yes | yes |
| 858-480 | Lumen | DEL MAR | – | yes | yes |
| 858-481 | AT&T | DEL MAR | – | – | yes |
| 858-483 | AT&T | LA JOLLA | – | – | yes |
| 858-484 | AT&T | RNCHOPNQTS | – | – | yes |
| 858-485 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-486 | AT&T | POWAY | – | – | yes |
| 858-487 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-488 | AT&T | LA JOLLA | – | – | yes |
| 858-490 | AT&T | LA JOLLA | – | – | yes |
| 858-492 | AT&T | SNDG LVTA | – | yes | yes |
| 858-493 | American Messaging | SNDG LVTA | – | – | yes |
| 858-494 | American Messaging | SNDG LVTA | – | – | yes |
| 858-495 | AT&T | SNDG LVTA | – | – | yes |
| 858-496 | AT&T | SNDG LVTA | – | yes | yes |
| 858-499 | AT&T | SNDG LVTA | – | yes | yes |
| 858-500 | Onvoy | LA JOLLA | – | yes | yes |
| 858-502 | AT&T | SNDG LVTA | – | yes | yes |
| 858-503 | AT&T | SNDG LVTA | – | yes | yes |
| 858-504 | T-Mobile | RNCHOSANFE | 2002-08-30 | yes | yes |
| 858-505 | AT&T | SNDG LVTA | – | – | yes |
| 858-509 | AT&T | DEL MAR | – | – | yes |
| 858-513 | AT&T | POWAY | – | – | yes |
| 858-514 | AT&T | SNDG LVTA | – | – | yes |
| 858-518 | T-Mobile | LA JOLLA | – | yes | yes |
| 858-519 | TPx | DEL MAR | – | yes | yes |
| 858-521 | AT&T | RNCHOBRNDO | – | yes | yes |
| 858-522 | AT&T | SNDG LVTA | – | yes | yes |
| 858-523 | AT&T | DEL MAR | – | yes | yes |
| 858-524 | AT&T | RNCHOBRNDO | – | yes | yes |
| 858-525 | AT&T | LA JOLLA | – | yes | yes |
| 858-526 | AT&T | LA JOLLA | – | yes | yes |
| 858-527 | AT&T | SNDG MRMS | – | yes | yes |
| 858-529 | Onvoy | LA JOLLA | – | yes | yes |
| 858-530 | AT&T | SNDG MRMS | – | yes | yes |
| 858-531 | AT&T | LA JOLLA | 2001-06-18 | – | yes |
| 858-533 | FRACTEL, LLC | HARBSNALPN | 2021-11-30 | yes | yes |
| 858-534 | AT&T | LA JOLLA | – | – | yes |
| 858-535 | AT&T | LA JOLLA | – | – | yes |
| 858-536 | AT&T | SNDG MRMS | – | yes | yes |
| 858-537 | AT&T | SNDG MRMS | – | yes | yes |
| 858-538 | AT&T | RNCHOPNQTS | – | – | yes |
| 858-539 | AT&T | LA JOLLA | – | yes | yes |
| 858-541 | AT&T | SNDG LVTA | – | yes | yes |
| 858-544 | FRACTEL, LLC | RNCHOBRNDO | 2021-09-24 | yes | yes |
| 858-546 | AT&T | LA JOLLA | – | – | yes |
| 858-547 | AT&T | SNDG MRMS | – | – | yes |
| 858-549 | AT&T | SNDG MRMS | – | – | yes |
| 858-550 | AT&T | LA JOLLA | – | – | yes |
| 858-551 | AT&T | LA JOLLA | – | – | yes |
| 858-552 | AT&T | LA JOLLA | – | yes | yes |
| 858-554 | AT&T | LA JOLLA | – | – | yes |
| 858-558 | AT&T | LA JOLLA | – | – | yes |
| 858-560 | AT&T | SNDG LVTA | – | – | yes |
| 858-564 | TPx | SNDG MRMS | – | yes | yes |
| 858-565 | AT&T | SNDG LVTA | – | – | yes |
| 858-566 | AT&T | SNDG MRMS | – | – | yes |
| 858-567 | FRACTEL, LLC | LA JOLLA | 2021-04-22 | yes | yes |
| 858-568 | AT&T | LA JOLLA | 2006-08-09 | yes | yes |
| 858-569 | AT&T | SNDG LVTA | – | – | yes |
| 858-571 | AT&T | SNDG LVTA | – | – | yes |
| 858-573 | AT&T | SNDG LVTA | – | – | yes |
| 858-576 | AT&T | SNDG LVTA | – | – | yes |
| 858-577 | AT&T | SNDG MRMS | – | – | yes |
| 858-578 | AT&T | SNDG MRMS | – | – | yes |
| 858-581 | AT&T | LA JOLLA | – | – | yes |
| 858-583 | T-Mobile | SNDG LVTA | 2001-09-24 | yes | yes |
| 858-585 | FRACTEL, LLC | LA MESA | 2019-03-19 | yes | yes |
| 858-586 | AT&T | SNDG MRMS | – | yes | yes |
| 858-587 | AT&T | LA JOLLA | – | – | yes |
| 858-588 | FRACTEL, LLC | RNCHOBRNDO | 2021-01-13 | yes | yes |
| 858-592 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-597 | AT&T | LA JOLLA | – | – | yes |
| 858-598 | AT&T | SNDG LVTA | – | yes | yes |
| 858-599 | FRACTEL, LLC | NATIONALCY | 2020-07-10 | yes | yes |
| 858-600 | EXIANT COMMUNICATIONS LLC | SNDG SNDG | 2026-03-10 | yes | yes |
| 858-602 | T-Mobile | POWAY | 2002-04-01 | yes | yes |
| 858-603 | AT&T | RNCHOPNQTS | – | – | yes |
| 858-605 | Windstream | RNCHOBRNDO | – | yes | yes |
| 858-609 | Verizon | SNDG LVTA | – | yes | yes |
| 858-610 | T-Mobile | SNDG MRMS | 2002-08-30 | yes | yes |
| 858-613 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-614 | AT&T | SNDG LVTA | – | yes | yes |
| 858-616 | AT&T | SNDG LVTA | – | yes | yes |
| 858-617 | Lumen | DEL MAR | – | yes | yes |
| 858-618 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-621 | AT&T | SNDG MRMS | – | yes | yes |
| 858-622 | AT&T | LA JOLLA | – | – | yes |
| 858-623 | AT&T | LA JOLLA | – | – | yes |
| 858-625 | AT&T | LA JOLLA | – | yes | yes |
| 858-626 | AT&T | LA JOLLA | – | – | yes |
| 858-627 | AT&T | SNDG LVTA | – | – | yes |
| 858-630 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | SNDG MRMS | – | yes | yes |
| 858-633 | AT&T | SNDG LVTA | – | yes | yes |
| 858-634 | Comcast | SNDG LVTA | – | yes | yes |
| 858-635 | AT&T | SNDG MRMS | – | yes | yes |
| 858-636 | AT&T | SNDG LVTA | – | yes | yes |
| 858-637 | AT&T | SNDG LVTA | – | yes | yes |
| 858-638 | AT&T | LA JOLLA | – | – | yes |
| 858-642 | AT&T | LA JOLLA | – | yes | yes |
| 858-643 | AT&T | LA JOLLA | – | – | yes |
| 858-644 | FRACTEL, LLC | SNDG MRMS | 2021-09-23 | yes | yes |
| 858-646 | AT&T | LA JOLLA | – | – | yes |
| 858-648 | EXIANT COMMUNICATIONS LLC | POWAY | 2018-02-23 | yes | yes |
| 858-649 | Lumen | RNCHOBRNDO | – | yes | yes |
| 858-650 | AT&T | SNDG LVTA | – | yes | yes |
| 858-651 | Lumen | LA JOLLA | – | – | yes |
| 858-652 | T-Mobile | LA JOLLA | 2006-09-21 | yes | yes |
| 858-653 | AT&T | SNDG MRMS | – | yes | yes |
| 858-654 | AT&T | SNDG LVTA | – | yes | yes |
| 858-655 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-657 | AT&T | LA JOLLA | – | – | yes |
| 858-658 | AT&T | LA JOLLA | – | – | yes |
| 858-663 | T-Mobile | POWAY | – | yes | yes |
| 858-665 | TON80 COMMUNICATIONS, LLC | LA JOLLA | 2022-01-19 | yes | yes |
| 858-666 | Onvoy | LA JOLLA | – | yes | yes |
| 858-667 | FRACTEL, LLC | SNDG LVTA | 2020-11-09 | yes | yes |
| 858-668 | AT&T | POWAY | – | yes | yes |
| 858-672 | AT&T | RNCHOPNQTS | – | yes | yes |
| 858-673 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-674 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-675 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-676 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-677 | AT&T | LA JOLLA | – | – | yes |
| 858-678 | AT&T | LA JOLLA | – | – | yes |
| 858-679 | AT&T | POWAY | – | – | yes |
| 858-682 | T-Mobile | POWAY | – | yes | yes |
| 858-683 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | RNCHOBRNDO | – | yes | yes |
| 858-684 | AT&T | SNDG MRMS | – | yes | yes |
| 858-687 | TON80 COMMUNICATIONS, LLC | POWAY | 2022-01-19 | yes | yes |
| 858-688 | T-Mobile | SNDG MRMS | 2001-09-24 | yes | yes |
| 858-689 | AT&T | SNDG MRMS | – | – | yes |
| 858-692 | Verizon | LA JOLLA | 2002-08-14 | yes | yes |
| 858-693 | AT&T | SNDG MRMS | – | – | yes |
| 858-694 | AT&T | SNDG LVTA | – | – | yes |
| 858-695 | AT&T | SNDG MRMS | – | yes | yes |
| 858-699 | AT&T | LA JOLLA | 2001-11-07 | yes | yes |
| 858-703 | Verizon | DEL MAR | – | yes | yes |
| 858-704 | Verizon | DEL MAR | – | yes | yes |
| 858-705 | AT&T | RNCHOBRNDO | – | yes | yes |
| 858-707 | TPx | SNDG LVTA | – | yes | yes |
| 858-712 | Verizon | SNDG LVTA | – | – | yes |
| 858-713 | TPx | LA JOLLA | – | yes | yes |
| 858-715 | AT&T | SNDG LVTA | – | – | yes |
| 858-716 | Verizon | RNCHOBRNDO | – | yes | yes |
| 858-717 | T-Mobile | SNDG LVTA | 2002-08-30 | yes | yes |
| 858-720 | AT&T | DEL MAR | – | – | yes |
| 858-722 | AT&T | POWAY | – | – | yes |
| 858-723 | NUSO, LLC | LA MESA | – | yes | yes |
| 858-724 | Verizon | DEL MAR | – | yes | yes |
| 858-726 | Verizon | POWAY | – | yes | yes |
| 858-727 | TON80 COMMUNICATIONS, LLC | SNDG SNDG | 2020-11-11 | yes | yes |
| 858-728 | Spok | SNDG MRMS | – | – | yes |
| 858-729 | AT&T | LA JOLLA | – | yes | yes |
| 858-731 | Verizon | LA JOLLA | – | yes | yes |
| 858-732 | Onvoy | LA JOLLA | – | yes | yes |
| 858-733 | T-Mobile | RNCHOPNQTS | 2002-08-30 | yes | yes |
| 858-735 | Verizon | POWAY | – | – | yes |
| 858-736 | Lumen | LA JOLLA | – | yes | yes |
| 858-737 | Verizon | SNDG LVTA | – | yes | yes |
| 858-740 | AT&T | SNDG MRMS | – | yes | yes |
| 858-742 | TON80 COMMUNICATIONS, LLC | SNDG LVTA | 2022-01-12 | yes | yes |
| 858-744 | FRACTEL, LLC | SNDG SNDG | 2021-04-23 | yes | yes |
| 858-746 | Lumen | POWAY | – | yes | yes |
| 858-748 | AT&T | POWAY | – | – | yes |
| 858-750 | Verizon | LA JOLLA | 2006-07-18 | yes | yes |
| 858-751 | TPx | SNDG LVTA | – | yes | yes |
| 858-752 | T-Mobile | LA JOLLA | – | yes | yes |
| 858-753 | Verizon | RNCHOBRNDO | – | yes | yes |
| 858-754 | Lumen | LA JOLLA | – | yes | yes |
| 858-755 | AT&T | DEL MAR | – | – | yes |
| 858-756 | AT&T | RNCHOSANFE | – | – | yes |
| 858-757 | Onvoy | SNDG MRMS | 2016-01-29 | yes | yes |
| 858-758 | FRACTEL, LLC | EL CAJON | 2020-09-17 | yes | yes |
| 858-759 | AT&T | RNCHOSANFE | – | – | yes |
| 858-761 | Verizon | SNDG MRMS | – | yes | yes |
| 858-762 | Lumen | POWAY | – | yes | yes |
| 858-764 | Windstream | DEL MAR | – | yes | yes |
| 858-765 | AT&T | LA JOLLA | 2021-08-10 | yes | yes |
| 858-766 | Onvoy | LA JOLLA | 2012-11-07 | yes | yes |
| 858-768 | Comcast | LA JOLLA | – | yes | yes |
| 858-769 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | SNDG LVTA | – | yes | yes |
| 858-771 | AT&T | RNCHOSANFE | 2004-11-05 | yes | yes |
| 858-774 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-775 | Verizon | LA JOLLA | – | – | yes |
| 858-776 | T-Mobile | RNCHOBRNDO | 2002-08-30 | yes | yes |
| 858-777 | TPx | LA JOLLA | – | – | yes |
| 858-779 | Lumen | RNCHOSANFE | – | yes | yes |
| 858-780 | AT&T | RNCHOPNQTS | – | yes | yes |
| 858-784 | AT&T | LA JOLLA | – | yes | yes |
| 858-786 | FRACTEL, LLC | NATIONALCY | 2021-03-16 | yes | yes |
| 858-787 | TON80 COMMUNICATIONS, LLC | PINEVALLEY | 2022-02-17 | yes | yes |
| 858-788 | FRACTEL, LLC | LA JOLLA | 2019-03-19 | yes | yes |
| 858-789 | FRACTEL, LLC | SNDG SNDG | 2021-01-04 | yes | yes |
| 858-790 | AT&T | SNDG MRMS | – | yes | yes |
| 858-792 | AT&T | DEL MAR | – | – | yes |
| 858-793 | AT&T | DEL MAR | – | – | yes |
| 858-794 | AT&T | DEL MAR | – | – | yes |
| 858-795 | AT&T | LA JOLLA | – | – | yes |
| 858-798 | Lumen | RNCHOBRNDO | – | yes | yes |
| 858-799 | Verizon | LA JOLLA | – | yes | yes |
| 858-800 | Bandwidth | SNDG MRMS | – | yes | yes |
| 858-805 | Lumen | SNDG MRMS | – | yes | yes |
| 858-808 | FRACTEL, LLC | NATIONALCY | 2022-02-18 | yes | yes |
| 858-810 | AT&T | SNDG LVTA | – | yes | yes |
| 858-812 | AT&T | LA JOLLA | – | – | yes |
| 858-815 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | RNCHOBRNDO | – | yes | yes |
| 858-822 | AT&T | LA JOLLA | – | yes | yes |
| 858-824 | AT&T | LA JOLLA | – | – | yes |
| 858-826 | AT&T | LA JOLLA | – | – | yes |
| 858-828 | FRACTEL, LLC | SNDG SNDG | 2022-02-18 | yes | yes |
| 858-829 | T-Mobile | POWAY | – | yes | yes |
| 858-831 | AT&T | SNDG MRMS | – | yes | yes |
| 858-832 | Comcast | RNCHOSANFE | – | yes | yes |
| 858-833 | FRACTEL, LLC | SNDG SNDG | 2020-09-17 | yes | yes |
| 858-834 | Lumen | RNCHOPNQTS | – | yes | yes |
| 858-836 | Verizon | SNDG LVTA | – | yes | yes |
| 858-837 | AT&T | RNCHOPNQTS | – | yes | yes |
| 858-838 | FRACTEL, LLC | CAMPO | 2022-05-10 | yes | yes |
| 858-842 | Comcast | POWAY | – | yes | yes |
| 858-844 | FRACTEL, LLC | EL CAJON | 2021-08-05 | yes | yes |
| 858-845 | Lumen | LA JOLLA | – | – | yes |
| 858-847 | AT&T | DEL MAR | – | yes | yes |
| 858-848 | AT&T | POWAY | – | yes | yes |
| 858-855 | FRACTEL, LLC | EL CAJON | 2021-04-23 | yes | yes |
| 858-858 | Charter | SNDG SNDG | 2023-05-22 | yes | yes |
| 858-859 | Verizon | POWAY | – | yes | yes |
| 858-860 | TPx | SNDG MRMS | – | yes | yes |
| 858-863 | Lumen | SNDG MRMS | – | yes | yes |
| 858-864 | T-Mobile | LA JOLLA | – | yes | yes |
| 858-866 | TPx | LA JOLLA | – | yes | yes |
| 858-867 | FRACTEL, LLC | SNDG SNDG | 2020-07-10 | yes | yes |
| 858-868 | HD CARRIER LLC | SNDG SNDG | 2018-12-19 | yes | yes |
| 858-869 | TPx | LA JOLLA | – | yes | yes |
| 858-874 | AT&T | SNDG LVTA | – | – | yes |
| 858-875 | TPx | LA JOLLA | – | – | yes |
| 858-876 | Lumen | DEL MAR | – | yes | yes |
| 858-877 | Verizon | SNDG MRMS | – | yes | yes |
| 858-878 | FRACTEL, LLC | LA MESA | 2022-02-18 | yes | yes |
| 858-879 | Verizon | RNCHOBRNDO | – | yes | yes |
| 858-880 | Verizon | SNDG MRMS | – | yes | yes |
| 858-881 | 8x8 | SNDG SNDG | 2026-05-20 | yes | yes |
| 858-882 | Lumen | LA JOLLA | – | yes | yes |
| 858-883 | T-Mobile | POWAY | – | yes | yes |
| 858-886 | AT&T | LA JOLLA | – | yes | yes |
| 858-888 | Bandwidth | LA JOLLA | – | yes | yes |
| 858-898 | FRACTEL, LLC | CORONADO | 2022-02-18 | yes | yes |
| 858-899 | FRACTEL, LLC | EL CAJON | 2021-01-04 | yes | yes |
| 858-900 | Onvoy | LA JOLLA | – | yes | yes |
| 858-901 | Verizon | RNCHOPNQTS | – | yes | yes |
| 858-902 | T-Mobile | CHULAVISTA | 2024-05-31 | yes | yes |
| 858-905 | Verizon | RNCHOPNQTS | – | yes | yes |
| 858-909 | AT&T | LA JOLLA | – | yes | yes |
| 858-910 | Onvoy | CHULAVISTA | 2021-04-01 | yes | yes |
| 858-914 | Lumen | RNCHOSANFE | – | yes | yes |
| 858-922 | Verizon | LA JOLLA | – | – | yes |
| 858-923 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | RNCHOSANFE | – | yes | yes |
| 858-924 | AT&T | RNCHOBRNDO | – | yes | yes |
| 858-925 | Lumen | DEL MAR | – | yes | yes |
| 858-926 | Verizon | LA JOLLA | – | yes | yes |
| 858-927 | Onvoy | RNCHOBRNDO | – | yes | yes |
| 858-933 | FRACTEL, LLC | DEL MAR | 2021-08-05 | yes | yes |
| 858-935 | Verizon | SNDG MRMS | – | yes | yes |
| 858-939 | AT&T | SNDG LVTA | – | yes | yes |
| 858-942 | AT&T | RNCHOBRNDO | – | – | yes |
| 858-943 | Lumen | RNCHOBRNDO | – | yes | yes |
| 858-944 | FRACTEL, LLC | SNDG LVTA | 2021-07-13 | yes | yes |
| 858-945 | Verizon | LA JOLLA | – | – | yes |
| 858-946 | Verizon | RNCHOBRNDO | – | yes | yes |
| 858-947 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | DEL MAR | – | yes | yes |
| 858-951 | Lumen | RNCHOSANFE | – | yes | yes |
| 858-952 | Lumen | LA JOLLA | 2005-12-19 | yes | yes |
| 858-955 | FRACTEL, LLC | PINEVALLEY | 2020-09-17 | yes | yes |
| 858-956 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | POWAY | – | yes | yes |
| 858-964 | Windstream | LA JOLLA | – | yes | yes |
| 858-966 | AT&T | SNDG LVTA | – | yes | yes |
| 858-967 | T-Mobile | LA JOLLA | – | yes | yes |
| 858-974 | AT&T | SNDG LVTA | – | – | yes |
| 858-977 | FRACTEL, LLC | DEL MAR | 2020-03-27 | yes | yes |
| 858-978 | AT&T | LA JOLLA | 2023-10-25 | yes | yes |
| 858-979 | AT&T | LA JOLLA | 2023-10-30 | yes | yes |
| 858-980 | AT&T | LA JOLLA | 2023-10-30 | yes | yes |
| 858-981 | AT&T | LA JOLLA | 2023-10-30 | yes | yes |
| 858-982 | AT&T | LA JOLLA | 2023-10-30 | yes | yes |
| 858-983 | AT&T | LA JOLLA | 2023-10-30 | yes | yes |
| 858-984 | AT&T | LA JOLLA | 2023-10-30 | yes | yes |
| 858-985 | AT&T | LA JOLLA | 2023-10-30 | yes | yes |
| 858-986 | AT&T | LA JOLLA | 2023-10-30 | yes | yes |
| 858-987 | Onvoy | SNDG LVTA | – | yes | yes |
| 858-988 | FRACTEL, LLC | SNDG SNDG | 2019-03-19 | yes | yes |
| 858-989 | AT&T | LA JOLLA | 2023-10-30 | yes | yes |
| 858-997 | Verizon | LA JOLLA | 2007-08-17 | yes | yes |
| 858-999 | Onvoy | LA JOLLA | – | yes | yes |
Frequently asked
How many prefixes does area code 858 have?
564 NXX blocks are assigned of 786 possible. Each block is 10,000 consecutive numbers, so the code currently covers about 5,640 thousand-number ranges across 19 rate centers.
What do the first three digits after 858 tell me?
They identify the block, which tells you the rate center it was allocated to and the carrier that received it. They do not tell you who serves the number today: portability moves numbers between carriers, and pooling splits a block between several of them.
Is a 858 prefix tied to a specific town?
To a rate center, which is billing geography rather than a town. NANPA abbreviates rate center names to ten characters and in large metros uses zone codes, so the name is a NANPA label, not a place name.
What does “pooled” mean in the 858 table?
That the block is in thousands-block pooling: carriers draw 1,000-number lots from it instead of taking all 10,000. 420 of 858's blocks are pooled, which is how regulators slowed down area code exhaustion – and why one prefix can belong to several carriers.
Source and limits
NANPA CO Code Assignment Records, all states, utilized codes, file updated 11/01/2026 – the rows where the record's Use field is “AS” (assigned). Unavailable codes are excluded. The records say who received a block and when, not who serves a particular number today.
More about this code: overview · carriers · spam complaints · local time