Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
Area code 737 prefixes
333 of the 786 possible NXX blocks are assigned in area code 737 (42.4% of capacity), spread across 35 rate centers and 45 holders. The largest holders are ONVOY, LLC - TX (82 blocks, 24.6%), T-MOBILE USA, INC. (33 blocks, 9.9%), NEW CINGULAR WIRELESS PCS, LLC - IL (29 blocks, 8.7%). Grouped by brand, Onvoy accounts for 82 blocks; brand-attributable holders cover 76% 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 2013-02-19 to 2026-10-20, with 43 blocks handed out in 2020 alone. 333 blocks (100%) 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. 10 assigned blocks (436, 439, 440, 441, 445, 446…) are not yet in service: assigned to a carrier but not open for calls, so a caller ID from one is spoofed. 230 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.
333 assigned blocks of 786
35 rate centers
45 holders of record
100% in thousands-block pooling
Largest holders in 737
| Holder of record, as NANPA names it | Brand | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC - TX | Onvoy | 82 | 24.6% |
| T-MOBILE USA, INC. | T-Mobile | 33 | 9.9% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | AT&T | 29 | 8.7% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | Verizon | 28 | 8.4% |
| FRACTEL, LLC | – | 26 | 7.8% |
| BANDWIDTH.COM CLEC, LLC - TX | Bandwidth | 21 | 6.3% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - TX | AT&T | 14 | 4.2% |
| TON80 COMMUNICATIONS, LLC | – | 9 | 2.7% |
| FOREMOST TELECOMMUNICATIONS CORPORATION - TX | – | 7 | 2.1% |
| COMMIO, LLC | – | 7 | 2.1% |
| METROPCS, INC. | T-Mobile | 6 | 1.8% |
| ONVOY SPECTRUM, LLC | Charter | 6 | 1.8% |
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 333 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 |
|---|---|---|---|---|---|
| 737-200 | Onvoy | ELGIN | 2015-10-13 | yes | yes |
| 737-201 | Onvoy | TAYLOR | 2014-12-24 | yes | yes |
| 737-202 | Lumen | AUSTIN | 2015-08-26 | yes | yes |
| 737-203 | Verizon | AUSTIN | 2015-09-22 | yes | yes |
| 737-204 | Onvoy | AUSTIN | 2015-11-18 | yes | yes |
| 737-205 | Onvoy | AUSTIN | – | yes | yes |
| 737-206 | T-Mobile | BASTROP | 2015-11-24 | yes | yes |
| 737-207 | AT&T | AUSTIN | 2015-11-18 | yes | yes |
| 737-208 | Verizon | AUSTIN | 2016-01-11 | yes | yes |
| 737-209 | Charter | AUSTIN | 2016-04-26 | yes | yes |
| 737-210 | Onvoy | AUSTIN | 2013-10-23 | yes | yes |
| 737-212 | Charter | AUSTIN | 2015-11-18 | yes | yes |
| 737-213 | Verizon | SAN MARCOS | 2016-01-11 | yes | yes |
| 737-214 | Onvoy | SAN MARCOS | 2017-04-14 | yes | yes |
| 737-215 | Verizon | GEORGETOWN | 2016-01-11 | yes | yes |
| 737-216 | Bandwidth | TAYLOR | 2016-06-28 | yes | yes |
| 737-217 | T-Mobile | AUSTIN | 2017-03-29 | yes | yes |
| 737-218 | Peerless | AUSTIN | – | yes | yes |
| 737-219 | AT&T | AUSTIN | 2017-04-07 | yes | yes |
| 737-220 | Vonage | AUSTIN | 2017-07-06 | yes | yes |
| 737-221 | T-Mobile | SAN MARCOS | 2017-07-20 | yes | yes |
| 737-222 | FOREMOST TELECOMMUNICATIONS CORPORATION - TX | AUSTIN | 2013-08-13 | yes | yes |
| 737-223 | AT&T | AUSTIN | 2017-02-02 | yes | yes |
| 737-224 | AUSTIN BESTLINE COMPANY | AUSTIN | 2017-10-27 | yes | yes |
| 737-225 | T-Mobile | ROCKDALE | – | yes | yes |
| 737-226 | Verizon | AUSTIN | 2015-07-01 | yes | yes |
| 737-227 | Lumen | WIMBERLEY | 2017-09-19 | yes | yes |
| 737-228 | AT&T | AUSTIN | 2017-09-20 | yes | yes |
| 737-229 | AT&T | AUSTIN | 2017-12-11 | yes | yes |
| 737-230 | AT&T | AUSTIN | 2018-01-12 | yes | yes |
| 737-231 | Bandwidth | AUSTIN | 2018-03-23 | yes | yes |
| 737-232 | T-Mobile | ELGIN | 2017-12-22 | yes | yes |
| 737-233 | Verizon | ELGIN | 2018-03-29 | yes | yes |
| 737-234 | Bandwidth | JARRELL | 2018-05-02 | yes | yes |
| 737-235 | Verizon | AUSTIN | 2018-05-04 | yes | yes |
| 737-236 | Bandwidth | AUSTIN | 2018-06-21 | yes | yes |
| 737-237 | Onvoy | AUSTIN | 2018-02-06 | yes | yes |
| 737-238 | Bandwidth | BERTRAM | 2018-06-21 | yes | yes |
| 737-239 | VoIP Innovations | AUSTIN | 2018-08-14 | yes | yes |
| 737-240 | Verizon | GEORGETOWN | 2016-10-11 | yes | yes |
| 737-241 | Onvoy | AUSTIN | 2017-08-16 | yes | yes |
| 737-242 | Bandwidth | AUSTIN | – | yes | yes |
| 737-243 | Peerless | AUSTIN | – | yes | yes |
| 737-244 | Bandwidth | TAYLOR | 2019-09-10 | yes | yes |
| 737-245 | Onvoy | GEORGETOWN | 2018-02-26 | yes | yes |
| 737-246 | AIRESPRING, INC. | AUSTIN | 2018-09-27 | yes | yes |
| 737-247 | Onvoy | AUSTIN | – | yes | yes |
| 737-248 | Verizon | KYLE | 2016-10-27 | yes | yes |
| 737-249 | IP GLOBAL NETWORKS - TX | AUSTIN | 2018-10-02 | yes | yes |
| 737-250 | Onvoy | MARTINDALE | 2018-02-22 | yes | yes |
| 737-251 | Peerless | BURNET | 2018-10-25 | yes | yes |
| 737-252 | Peerless | LIBERTY HL | 2018-10-25 | yes | yes |
| 737-253 | Vonage | GEORGETOWN | 2018-11-15 | yes | yes |
| 737-254 | AT&T | AUSTIN | 2025-05-06 | yes | yes |
| 737-255 | EXIANT COMMUNICATIONS LLC | AUSTIN | 2019-03-01 | yes | yes |
| 737-256 | Verizon | AUSTIN | 2019-03-04 | yes | yes |
| 737-257 | Bandwidth | SANGABRIEL | 2019-05-02 | yes | yes |
| 737-258 | AT&T | MILANO | 2019-07-26 | yes | yes |
| 737-259 | Lumen | HUTTO | 2019-09-20 | yes | yes |
| 737-260 | Onvoy | DRIPPNGSPG | 2018-02-26 | yes | yes |
| 737-261 | AT&T | AUSTIN | 2019-10-08 | yes | yes |
| 737-262 | Verizon | AUSTIN | 2019-10-16 | yes | yes |
| 737-263 | AT&T | AUSTIN | 2019-12-13 | yes | yes |
| 737-264 | T-Mobile | LOCKHART | 2019-12-30 | yes | yes |
| 737-265 | AT&T | KYLE | 2020-01-10 | yes | yes |
| 737-266 | Lumen | SAN MARCOS | 2020-01-23 | yes | yes |
| 737-267 | AT&T | AUSTIN | 2020-02-19 | yes | yes |
| 737-268 | Verizon | AUSTIN | 2020-06-10 | yes | yes |
| 737-269 | AT&T | AUSTIN | 2020-06-18 | yes | yes |
| 737-270 | NUSO, LLC | AUSTIN | 2020-06-26 | yes | yes |
| 737-271 | Onvoy | DRIPPNGSPG | – | yes | yes |
| 737-272 | AT&T | AUSTIN | 2020-08-06 | yes | yes |
| 737-273 | Onvoy | AUSTIN | 2019-12-23 | yes | yes |
| 737-274 | T-Mobile | BASTROP | 2020-08-27 | yes | yes |
| 737-275 | Bandwidth | GEORGETOWN | 2020-09-08 | yes | yes |
| 737-276 | AT&T | KYLE | 2020-09-16 | yes | yes |
| 737-277 | Onvoy | AUSTIN | 2020-08-12 | yes | yes |
| 737-278 | Verizon | BASTROP | 2020-09-23 | yes | yes |
| 737-279 | Verizon | AUSTIN | 2020-09-24 | yes | yes |
| 737-280 | AT&T | AUSTIN | 2020-09-28 | yes | yes |
| 737-281 | IP HORIZON LLC | AUSTIN | 2020-09-28 | yes | yes |
| 737-282 | Onvoy | DALE/LTNSP | 2021-01-07 | yes | yes |
| 737-283 | Onvoy | LOMETA | 2021-01-08 | yes | yes |
| 737-284 | Onvoy | WIMBERLEY | 2021-01-08 | yes | yes |
| 737-285 | AT&T | AUSTIN | 2021-01-11 | yes | yes |
| 737-286 | COMMIO, LLC | KYLE | 2021-04-14 | yes | yes |
| 737-287 | T-Mobile | LEANDER | 2021-04-29 | yes | yes |
| 737-288 | FRACTEL, LLC | AUSTIN | 2021-05-10 | yes | yes |
| 737-289 | AT&T | AUSTIN | 2021-06-18 | yes | yes |
| 737-290 | Bandwidth | GEORGETOWN | 2021-07-29 | yes | yes |
| 737-291 | AT&T | AUSTIN | 2021-08-17 | yes | yes |
| 737-292 | Onvoy | AUSTIN | 2021-06-23 | yes | yes |
| 737-293 | T-Mobile | BASTROP | 2021-08-20 | yes | yes |
| 737-294 | T-Mobile | BASTROP | 2021-08-20 | yes | yes |
| 737-295 | Onvoy | AUSTIN | 2021-08-24 | yes | yes |
| 737-296 | T-Mobile | AUSTIN | 2021-08-24 | yes | yes |
| 737-297 | T-Mobile | AUSTIN | 2021-08-25 | yes | yes |
| 737-298 | T-Mobile | LEANDER | 2021-09-09 | yes | yes |
| 737-299 | Onvoy | LAMPASAS | 2018-02-26 | yes | yes |
| 737-300 | Onvoy | AUSTIN | 2015-03-25 | yes | yes |
| 737-301 | Bandwidth | AUSTIN | 2021-09-14 | yes | yes |
| 737-302 | T-Mobile | SMITHVILLE | 2016-05-19 | yes | yes |
| 737-303 | SKYE TELECOM LLC DBA SKYETEL | SAN MARCOS | 2021-09-07 | yes | yes |
| 737-304 | Charter | AUSTIN | – | yes | yes |
| 737-305 | AT&T | BUDA | 2021-10-05 | yes | yes |
| 737-306 | AT&T | HUTTO | 2021-10-18 | yes | yes |
| 737-307 | Onvoy | BERTRAM | 2020-12-28 | yes | yes |
| 737-308 | Verizon | AUSTIN | 2021-10-22 | yes | yes |
| 737-309 | CALLWORKS CORPORATION | AUSTIN | 2021-11-01 | yes | yes |
| 737-310 | HD CARRIER LLC | WIMBERLEY | 2021-11-04 | yes | yes |
| 737-312 | Onvoy | KYLE | 2021-11-02 | yes | yes |
| 737-313 | Dish | AUSTIN | 2021-12-29 | yes | yes |
| 737-314 | Verizon | GEORGETOWN | 2022-01-26 | yes | yes |
| 737-315 | Dish | SAN MARCOS | 2022-01-27 | yes | yes |
| 737-316 | Onvoy | WIMBERLEY | 2023-07-28 | yes | yes |
| 737-317 | Onvoy | DRIPPNGSPG | 2020-12-28 | yes | yes |
| 737-318 | T-Mobile | BASTROP | 2022-02-02 | yes | yes |
| 737-319 | AT&T | AUSTIN | 2022-02-04 | yes | yes |
| 737-320 | Windstream | AUSTIN | 2022-02-28 | yes | yes |
| 737-321 | T-Mobile | ELGIN | 2022-03-01 | yes | yes |
| 737-322 | Bandwidth | ADAMSVILLE | – | yes | yes |
| 737-323 | T-Mobile | LEANDER | 2022-05-27 | yes | yes |
| 737-324 | T-Mobile | LEANDER | 2022-05-27 | yes | yes |
| 737-325 | Onvoy | AUSTIN | 2023-09-13 | yes | yes |
| 737-326 | T-Mobile | AUSTIN | 2022-06-28 | yes | yes |
| 737-327 | Onvoy | HUTTO | 2020-12-28 | yes | yes |
| 737-328 | T-Mobile | AUSTIN | 2022-06-28 | yes | yes |
| 737-329 | Verizon | AUSTIN | 2022-07-28 | yes | yes |
| 737-330 | AT&T | AUSTIN | 2022-08-16 | yes | yes |
| 737-331 | Bandwidth | DALE/LTNSP | 2022-09-02 | yes | yes |
| 737-332 | Onvoy | BURNET | 2020-10-28 | yes | yes |
| 737-333 | FOREMOST TELECOMMUNICATIONS CORPORATION - TX | AUSTIN | 2013-03-01 | yes | yes |
| 737-334 | Bandwidth | AUSTIN | 2022-09-23 | yes | yes |
| 737-335 | T-Mobile | SAN MARCOS | 2022-09-27 | yes | yes |
| 737-336 | FRACTEL, LLC | AUSTIN | 2020-08-18 | yes | yes |
| 737-337 | Onvoy | FENTRESS | – | yes | yes |
| 737-338 | Onvoy | ELGIN | 2020-11-25 | yes | yes |
| 737-339 | Bandwidth | TAYLOR | 2022-09-28 | yes | yes |
| 737-340 | T-Mobile | GEORGETOWN | 2022-10-03 | yes | yes |
| 737-341 | T-Mobile | AUSTIN | 2022-10-06 | yes | yes |
| 737-342 | T-Mobile | AUSTIN | 2022-10-06 | yes | yes |
| 737-343 | Verizon | AUSTIN | 2022-10-12 | yes | yes |
| 737-344 | Onvoy | SAN MARCOS | 2020-10-28 | yes | yes |
| 737-345 | FRACTEL, LLC | GRANGER | 2020-07-02 | yes | yes |
| 737-346 | AUSTIN BESTLINE COMPANY | AUSTIN | 2013-07-23 | yes | yes |
| 737-347 | CSC VOICE, LLC | BASTROP | 2022-10-14 | yes | yes |
| 737-348 | FRACTEL, LLC | BASTROP | 2019-12-30 | yes | yes |
| 737-349 | Verizon | GEORGETOWN | 2022-10-17 | yes | yes |
| 737-350 | NUSO, LLC | BASTROP | 2022-11-15 | yes | yes |
| 737-351 | AT&T | AUSTIN | 2022-11-15 | yes | yes |
| 737-352 | Verizon | BASTROP | 2022-11-15 | yes | yes |
| 737-353 | TERRA NOVA TELECOM INC. | BUDA | – | yes | yes |
| 737-354 | NUSO, LLC | AUSTIN | 2023-02-16 | yes | yes |
| 737-355 | Bandwidth | LOCKHART | 2023-01-25 | yes | yes |
| 737-356 | FRACTEL, LLC | GEORGETOWN | 2019-05-21 | yes | yes |
| 737-357 | Charter | LOCKHART | 2021-05-28 | yes | yes |
| 737-358 | Comcast | AUSTIN | 2023-02-28 | yes | yes |
| 737-359 | HADLO TECHNOLOGIES, LLC | AUSTIN | 2023-05-05 | yes | yes |
| 737-360 | Dish | JARRELL | 2023-04-03 | yes | yes |
| 737-361 | Onvoy | TAYLOR | 2023-09-29 | yes | yes |
| 737-362 | AT&T | MARTINDALE | 2023-11-02 | yes | yes |
| 737-363 | T-Mobile | AUSTIN | 2023-11-07 | yes | yes |
| 737-364 | FIVE9, INC. | SANGABRIEL | 2024-10-07 | yes | yes |
| 737-365 | Vonage | BURNET | 2023-11-22 | yes | yes |
| 737-366 | Onvoy | MILANO | 2020-11-16 | yes | yes |
| 737-367 | Onvoy | AUSTIN | 2023-12-12 | yes | yes |
| 737-368 | AT&T | AUSTIN | 2023-12-12 | yes | yes |
| 737-369 | COMMIO, LLC | ROCKDALE | 2023-12-20 | yes | yes |
| 737-370 | COMMIO, LLC | AUSTIN | 2023-12-20 | yes | yes |
| 737-371 | COMMIO, LLC | GEORGETOWN | 2023-12-20 | yes | yes |
| 737-372 | Onvoy | BUCHANNDAM | – | yes | yes |
| 737-373 | FRACTEL, LLC | SAN MARCOS | 2019-05-21 | yes | yes |
| 737-374 | COMMIO, LLC | KYLE | 2023-12-21 | yes | yes |
| 737-375 | Charter | ROCKDALE | 2021-05-28 | yes | yes |
| 737-376 | Verizon | AUSTIN | 2024-02-15 | yes | yes |
| 737-377 | FRACTEL, LLC | AUSTIN | 2020-06-18 | yes | yes |
| 737-378 | TON80 COMMUNICATIONS, LLC | KYLE | 2022-01-26 | yes | yes |
| 737-379 | Onvoy | LEANDER | 2024-03-12 | yes | yes |
| 737-380 | CSC VOICE, LLC | LAMPASAS | 2024-03-18 | yes | yes |
| 737-381 | Onvoy | AUSTIN | 2024-03-18 | yes | yes |
| 737-382 | AT&T | AUSTIN | 2024-03-21 | yes | yes |
| 737-383 | Onvoy | GEORGETOWN | 2024-04-02 | yes | yes |
| 737-384 | Dish | AUSTIN | 2024-04-03 | yes | yes |
| 737-385 | Onvoy | ELGIN | 2024-04-10 | yes | yes |
| 737-386 | FRACTEL, LLC | LAMPASAS | 2021-10-26 | yes | yes |
| 737-387 | Onvoy | SAN MARCOS | 2023-02-17 | yes | yes |
| 737-388 | Onvoy | KYLE | 2024-04-10 | yes | yes |
| 737-389 | Verizon | AUSTIN | 2024-05-23 | yes | yes |
| 737-390 | Onvoy | BASTROP | 2024-05-29 | yes | yes |
| 737-391 | Onvoy | HUTTO | 2024-06-06 | yes | yes |
| 737-392 | Twilio | SAN MARCOS | 2024-06-10 | yes | yes |
| 737-393 | AT&T | AUSTIN | 2024-06-21 | yes | yes |
| 737-394 | Bandwidth | AUSTIN | 2024-07-10 | yes | yes |
| 737-395 | AT&T | AUSTIN | 2024-08-28 | yes | yes |
| 737-396 | FIVE9, INC. | AUSTIN | 2024-08-30 | yes | yes |
| 737-397 | Verizon | AUSTIN | 2024-09-24 | yes | yes |
| 737-398 | T-Mobile | AUSTIN | 2024-10-02 | yes | yes |
| 737-399 | T-Mobile | AUSTIN | 2024-10-14 | yes | yes |
| 737-400 | Onvoy | AUSTIN | 2015-10-13 | yes | yes |
| 737-401 | AT&T | AUSTIN | 2016-10-18 | yes | yes |
| 737-402 | Telnyx | AUSTIN | 2016-12-02 | yes | yes |
| 737-403 | Verizon | GEORGETOWN | 2024-11-14 | yes | yes |
| 737-404 | Charter | KYLE | 2015-09-21 | yes | yes |
| 737-405 | T-Mobile | KYLE | 2024-12-03 | yes | yes |
| 737-406 | AT&T | AUSTIN | 2024-12-12 | yes | yes |
| 737-407 | AT&T | WIMBERLEY | 2025-01-06 | yes | yes |
| 737-408 | Verizon | AUSTIN | 2025-01-06 | yes | yes |
| 737-409 | Onvoy | AUSTIN | 2025-01-09 | yes | yes |
| 737-410 | Charter | AUSTIN | 2025-01-29 | yes | yes |
| 737-412 | AT&T | AUSTIN | 2025-02-10 | yes | yes |
| 737-413 | T-Mobile | SMITHVILLE | 2025-02-10 | yes | yes |
| 737-414 | T-Mobile | BUDA | 2016-11-02 | yes | yes |
| 737-415 | IP HORIZON LLC | AUSTIN | 2025-02-26 | yes | yes |
| 737-416 | IP HORIZON LLC | ELGIN | 2025-02-26 | yes | yes |
| 737-417 | IP HORIZON LLC | LIBERTY HL | 2025-03-31 | yes | yes |
| 737-418 | Onvoy | AUSTIN | 2025-04-08 | yes | yes |
| 737-419 | Verizon | AUSTIN | 2025-05-02 | yes | yes |
| 737-420 | COMMIO, LLC | AUSTIN | 2021-11-03 | yes | yes |
| 737-421 | T-Mobile | ROCKDALE | 2025-06-06 | yes | yes |
| 737-422 | TERRA NOVA TELECOM INC. | SAN MARCOS | 2025-07-15 | yes | yes |
| 737-423 | WAVENATION, LLC | AUSTIN | 2025-07-18 | yes | yes |
| 737-424 | T-Mobile | BASTROP | 2025-07-21 | yes | yes |
| 737-425 | AT&T | GEORGETOWN | 2025-08-28 | yes | yes |
| 737-426 | T-Mobile | BASTROP | 2025-10-01 | yes | yes |
| 737-427 | Onvoy | MCDADE | 2020-12-28 | yes | yes |
| 737-428 | AT&T | AUSTIN | 2025-10-29 | yes | yes |
| 737-429 | Verizon | AUSTIN | 2025-11-13 | yes | yes |
| 737-430 | AT&T | AUSTIN | 2025-11-20 | yes | yes |
| 737-431 | Verizon | AUSTIN | 2025-12-03 | yes | yes |
| 737-432 | Onvoy | LEANDER | 2025-12-11 | yes | yes |
| 737-433 | AT&T | BASTROP | 2026-01-05 | yes | yes |
| 737-434 | Onvoy | AUSTIN | 2026-02-18 | yes | yes |
| 737-435 | AT&T | AUSTIN | 2026-05-28 | yes | yes |
| 737-436 | Onvoy | BUDA | 2026-06-30 | yes | no |
| 737-437 | Onvoy | THORNDTHRL | – | yes | yes |
| 737-438 | AHOI LLC | AUSTIN | 2026-03-26 | yes | yes |
| 737-439 | Onvoy | AUSTIN | 2026-06-30 | yes | no |
| 737-440 | T-Mobile | AUSTIN | 2026-06-16 | yes | no |
| 737-441 | Onvoy | GEORGETOWN | 2026-08-06 | yes | no |
| 737-442 | AT&T | AUSTIN | 2026-06-02 | yes | yes |
| 737-443 | Lumen | AUSTIN | – | yes | yes |
| 737-444 | FOREMOST TELECOMMUNICATIONS CORPORATION - TX | GEORGETOWN | 2013-03-04 | yes | yes |
| 737-445 | AT&T | GEORGETOWN | 2026-09-21 | yes | no |
| 737-446 | Onvoy | AUSTIN | 2026-10-20 | yes | no |
| 737-448 | T-Mobile | DRIPPNGSPG | 2026-05-18 | yes | yes |
| 737-450 | Onvoy | LOCKHART | 2025-12-17 | yes | yes |
| 737-455 | T-Mobile | AUSTIN | 2026-06-16 | yes | no |
| 737-465 | FRACTEL, LLC | AUSTIN | 2019-05-21 | yes | yes |
| 737-471 | AT&T | AUSTIN | 2018-03-22 | yes | yes |
| 737-473 | Onvoy | SANGABRIEL | 2020-12-28 | yes | yes |
| 737-477 | FRACTEL, LLC | LOCKHART | 2020-07-09 | yes | yes |
| 737-484 | Verizon | AUSTIN | 2015-07-07 | yes | yes |
| 737-497 | Onvoy | AUSTIN | 2023-01-09 | yes | yes |
| 737-500 | Onvoy | BASTROP | 2019-07-25 | yes | yes |
| 737-510 | Onvoy | BERTRAM | 2019-07-25 | yes | yes |
| 737-520 | Onvoy | FENTRESS | 2019-07-25 | yes | yes |
| 737-529 | Onvoy | AUSTIN | 2015-02-02 | yes | yes |
| 737-530 | Onvoy | LOMETA | 2019-07-25 | yes | yes |
| 737-537 | Onvoy | LAMPASAS | – | yes | yes |
| 737-577 | FRACTEL, LLC | BRIGGS | 2020-07-09 | yes | yes |
| 737-587 | FRACTEL, LLC | AUSTIN | 2021-12-30 | yes | yes |
| 737-600 | Onvoy | AUSTIN | 2015-04-14 | yes | yes |
| 737-610 | Onvoy | AUSTIN | – | yes | yes |
| 737-615 | Onvoy | AUSTIN | – | yes | yes |
| 737-618 | T-Mobile | LAMPASAS | 2015-11-24 | yes | yes |
| 737-637 | Onvoy | THORNDTHRL | 2018-08-21 | yes | yes |
| 737-666 | FOREMOST TELECOMMUNICATIONS CORPORATION - TX | ELGIN | 2013-03-04 | yes | yes |
| 737-667 | FRACTEL, LLC | GEORGETOWN | 2020-06-18 | yes | yes |
| 737-677 | Onvoy | SMITHVILLE | 2020-12-28 | yes | yes |
| 737-678 | TON80 COMMUNICATIONS, LLC | DRIPPNGSPG | 2021-09-03 | yes | yes |
| 737-688 | FRACTEL, LLC | COUPLAND | 2021-05-10 | yes | yes |
| 737-701 | AT&T | AUSTIN | 2015-09-17 | yes | yes |
| 737-702 | Bandwidth | GRANGER | 2015-05-06 | yes | yes |
| 737-703 | Onvoy | AUSTIN | – | yes | yes |
| 737-704 | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | AUSTIN | 2014-04-10 | yes | yes |
| 737-707 | SKYE TELECOM LLC DBA SKYETEL | AUSTIN | 2021-09-07 | yes | yes |
| 737-708 | T-Mobile | AUSTIN | – | yes | yes |
| 737-710 | Charter | AUSTIN | 2019-10-09 | yes | yes |
| 737-717 | Onvoy | AUSTIN | 2016-01-18 | yes | yes |
| 737-727 | Onvoy | MCDADE | 2018-08-21 | yes | yes |
| 737-730 | VoIP Innovations | BASTROP | 2026-07-21 | yes | no |
| 737-732 | FRACTEL, LLC | ROCKDALE | 2020-07-02 | yes | yes |
| 737-733 | FRACTEL, LLC | BASTROP | 2020-07-09 | yes | yes |
| 737-734 | Onvoy | LIBERTY HL | – | yes | yes |
| 737-737 | USFON, INC. - TX | SAN MARCOS | 2023-01-25 | yes | yes |
| 737-738 | Onvoy | GEORGETOWN | 2021-02-02 | yes | yes |
| 737-742 | TON80 COMMUNICATIONS, LLC | AUSTIN | 2021-04-29 | yes | yes |
| 737-746 | TON80 COMMUNICATIONS, LLC | BERTRAM | 2022-01-13 | yes | yes |
| 737-747 | T-Mobile | BURNET | 2016-05-19 | yes | yes |
| 737-757 | Bandwidth | LEANDER | 2016-06-24 | yes | yes |
| 737-758 | FRACTEL, LLC | KEMPNER | 2019-05-21 | yes | yes |
| 737-762 | TON80 COMMUNICATIONS, LLC | SMITHVILLE | 2021-09-03 | yes | yes |
| 737-766 | FRACTEL, LLC | LEANDER | 2019-05-21 | yes | yes |
| 737-767 | TON80 COMMUNICATIONS, LLC | LAMPASAS | 2021-02-24 | yes | yes |
| 737-770 | INVOXIO INCORPORATED | BUDA | 2018-07-03 | yes | yes |
| 737-773 | Onvoy | JARRELL | – | yes | yes |
| 737-775 | Charter | GEORGETOWN | 2024-01-10 | yes | yes |
| 737-777 | FOREMOST TELECOMMUNICATIONS CORPORATION - TX | LEANDER | 2013-02-19 | yes | yes |
| 737-781 | Verizon | AUSTIN | 2016-03-07 | yes | yes |
| 737-786 | FRACTEL, LLC | ELGIN | 2021-01-12 | yes | yes |
| 737-787 | HD CARRIER LLC | AUSTIN | 2020-02-28 | yes | yes |
| 737-788 | FRACTEL, LLC | BURNET | 2021-04-14 | yes | yes |
| 737-799 | FRACTEL, LLC | GRANGER | 2021-03-02 | yes | yes |
| 737-800 | Onvoy | AUSTIN | 2015-01-28 | yes | yes |
| 737-802 | Verizon | AUSTIN | 2015-08-19 | yes | yes |
| 737-808 | Bandwidth | GEORGETOWN | 2015-06-08 | yes | yes |
| 737-825 | TON80 COMMUNICATIONS, LLC | AUSTIN | 2020-05-08 | yes | yes |
| 737-828 | TON80 COMMUNICATIONS, LLC | KEMPNER | 2021-04-08 | yes | yes |
| 737-837 | Onvoy | TAYLOR | 2018-08-21 | yes | yes |
| 737-842 | FRACTEL, LLC | PAIGE | 2020-09-03 | yes | yes |
| 737-843 | Verizon | LEANDER | 2015-11-24 | yes | yes |
| 737-864 | TON80 COMMUNICATIONS, LLC | TAYLOR | 2021-03-02 | yes | yes |
| 737-867 | COMMIO, LLC | AUSTIN | 2016-11-02 | yes | yes |
| 737-877 | FRACTEL, LLC | BUDA | 2020-09-03 | yes | yes |
| 737-880 | 8x8 | AUSTIN | 2026-09-16 | yes | no |
| 737-881 | AT&T | BASTROP | 2016-09-07 | yes | yes |
| 737-888 | FOREMOST TELECOMMUNICATIONS CORPORATION - TX | TAYLOR | 2013-03-04 | yes | yes |
| 737-895 | Twilio | AUSTIN | 2020-08-05 | yes | yes |
| 737-899 | FRACTEL, LLC | BASTROP | 2020-11-27 | yes | yes |
| 737-900 | TERRA NOVA TELECOM INC. | AUSTIN | 2019-03-19 | yes | yes |
| 737-910 | Onvoy | AUSTIN | 2020-12-08 | yes | yes |
| 737-931 | TPx | AUSTIN | 2016-10-27 | yes | yes |
| 737-932 | Onvoy | AUSTIN | – | yes | yes |
| 737-937 | Onvoy | MARTINDALE | 2020-12-28 | yes | yes |
| 737-946 | FRACTEL, LLC | ADAMSVILLE | 2020-09-03 | yes | yes |
| 737-973 | Bandwidth | BRIGGS | 2015-05-07 | yes | yes |
| 737-975 | Onvoy | AUSTIN | 2024-10-14 | yes | yes |
| 737-977 | FRACTEL, LLC | AUSTIN | 2020-11-27 | yes | yes |
| 737-980 | INVOXIO INCORPORATED | COUPLAND | 2018-07-09 | yes | yes |
| 737-983 | AT&T | LOCKHART | 2024-10-23 | yes | yes |
| 737-990 | INVOXIO INCORPORATED | AUSTIN | 2018-05-22 | yes | yes |
| 737-998 | Onvoy | AUSTIN | 2026-08-06 | yes | no |
| 737-999 | FOREMOST TELECOMMUNICATIONS CORPORATION - TX | BUDA | 2013-03-04 | yes | yes |
Frequently asked
How many prefixes does area code 737 have?
333 NXX blocks are assigned of 786 possible. Each block is 10,000 consecutive numbers, so the code currently covers about 3,330 thousand-number ranges across 35 rate centers.
What do the first three digits after 737 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 737 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 737 table?
That the block is in thousands-block pooling: carriers draw 1,000-number lots from it instead of taking all 10,000. 333 of 737'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