NumberResearchRecent prefix assignments
380 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 2026-04
Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.
Most active assignees, last 30 days
New assignments by month
Sep 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 972-507 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-508 | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | PROSPER | TX | |
| 972-509 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-510 | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | IRVING | TX | |
| 972-511 | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | TX | |
| 972-512 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CARROLLTON | TX | |
| 972-513 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-514 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-515 | SOUTHWESTERN BELL | 9533 | RED OAK | TX | |
| 972-516 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-517 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-518 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-519 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-521 | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 7516 | ALLEN | TX | |
| 972-522 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-523 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | GRANDPRARI | TX | |
| 972-524 | SOUTHWESTERN BELL | 9533 | TERRELL | TX | |
| 972-525 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | WILMER | TX | |
| 972-527 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-528 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-529 | SOUTHWESTERN BELL | 9533 | MCKINNEY | TX | |
| 972-530 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-531 | AT&T - LOCAL | 7421 | PLANO | TX | |
| 972-532 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DALLAS | TX | |
| 972-534 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DLFTWTARPT | TX | |
| 972-535 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLANO | TX | |
| 972-536 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | IRVING | TX | |
| 972-537 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | LEWISVILLE | TX | |
| 972-538 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LEWISVILLE | TX | |
| 972-539 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | LEWISVILLE | TX | |
| 972-540 | SOUTHWESTERN BELL | 9533 | MCKINNEY | TX | |
| 972-541 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-542 | SOUTHWESTERN BELL | 9533 | MCKINNEY | TX | |
| 972-543 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLANO | TX | |
| 972-544 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | FERRIS | TX | |
| 972-545 | SPOK, INC. | 6630 | IRVING | TX | |
| 972-546 | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | DALLAS | TX | |
| 972-547 | SOUTHWESTERN BELL | 9533 | MCKINNEY | TX | |
| 972-548 | SOUTHWESTERN BELL | 9533 | MCKINNEY | TX | |
| 972-549 | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | MCKINNEY | TX | |
| 972-550 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-551 | SOUTHWESTERN BELL | 9533 | TERRELL | TX | |
| 972-552 | SOUTHWESTERN BELL | 9533 | FORNEY | TX | |
| 972-553 | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | PLANO | TX | |
| 972-554 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-555 | MULTIPLE OCN LISTING | MULT | DIR ASST | TX | |
| 972-556 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-557 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-558 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-559 | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 2026-04 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.