LADUE prefixes in area code 557
NANPA records 17 assigned NXX blocks to rate center LADUE in area code 557, 20.2% of the 84 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 4 holders hold those blocks, the largest being CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO (6), ONVOY, LLC - MO (5), NEW CINGULAR WIRELESS PCS, LLC - IL (5). The earliest assignment on record here is 2022-08-08 and the most recent 2026-09-09. 17 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area code 314 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 557-200 | Onvoy ONVOY, LLC - MO | 2022-08-08 | yes | yes |
| 557-208 | Onvoy ONVOY, LLC - MO | 2023-09-07 | yes | yes |
| 557-210 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 2023-09-21 | yes | yes |
| 557-218 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2023-12-22 | yes | yes |
| 557-219 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 2024-01-18 | yes | yes |
| 557-223 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 2024-04-10 | yes | yes |
| 557-225 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2024-04-10 | yes | yes |
| 557-232 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 2025-02-18 | yes | yes |
| 557-236 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 2025-04-24 | yes | yes |
| 557-237 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2025-05-23 | yes | yes |
| 557-240 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 2025-09-03 | yes | yes |
| 557-241 | Onvoy ONVOY, LLC - MO | 2025-09-24 | yes | yes |
| 557-249 | Onvoy ONVOY, LLC - MO | 2026-01-13 | yes | yes |
| 557-254 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2026-05-27 | yes | no |
| 557-255 | Onvoy ONVOY, LLC - MO | 2026-05-29 | yes | yes |
| 557-260 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 2026-07-23 | yes | yes |
| 557-264 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2026-09-09 | yes | no |
The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | Verizon | 6 | 35.3% |
| ONVOY, LLC - MO | Onvoy | 5 | 29.4% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | AT&T | 5 | 29.4% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MO | AT&T | 1 | 5.9% |
Same rate center in other codes
Overlay codes cover the same geography, so one rate center is served by all of them.
Frequently asked
Which prefixes belong to LADUE in area code 557?
17 blocks: 200, 208, 210, 218, 219, 223, 225, 232, 236, 237, 240, 241 and 5 more, all listed in the table above.
Which carriers have numbers in LADUE?
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO (6 blocks), ONVOY, LLC - MO (5 blocks), NEW CINGULAR WIRELESS PCS, LLC - IL (5 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - MO (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is LADUE a city?
It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.