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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Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 972-402 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-403 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-404 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-405 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-406 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-407 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-408 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GRANDPRARI | TX | |
| 972-409 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-410 | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | LEWISVILLE | TX | |
| 972-411 | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | TX | |
| 972-412 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-413 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-414 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-416 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | CARROLLTON | TX | |
| 972-417 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | CARROLLTON | TX | |
| 972-418 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | CARROLLTON | TX | |
| 972-419 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-420 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | LEWISVILLE | TX | |
| 972-421 | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 7516 | DALLAS | TX | |
| 972-422 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-423 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-424 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-425 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | DLFTWTARPT | TX | |
| 972-426 | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 7516 | DLFTWTARPT | TX | |
| 972-427 | SOUTHWESTERN BELL | 9533 | CRANDALL | TX | |
| 972-428 | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 7516 | CARROLLTON | TX | |
| 972-429 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-431 | CENTURYLINK COMMUNICATIONS, LLC | 508J | PLANO | TX | |
| 972-432 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-434 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | LEWISVILLE | TX | |
| 972-435 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | MAYPEARL | TX | |
| 972-436 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | LEWISVILLE | TX | |
| 972-437 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-438 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-439 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MCKINNEY | TX | |
| 972-440 | ONVOY, LLC - TX | 903C | CARROLLTON | TX | |
| 972-441 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | WILMER | TX | |
| 972-442 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-443 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-444 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-445 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-446 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | CARROLLTON | TX | |
| 972-447 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-448 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-449 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | PALMER | TX | |
| 972-450 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-451 | SPOK, INC. | 6630 | GRANDPRARI | TX | |
| 972-452 | TEXAS WINDSTREAM, LLC | 2153 | SCURRY | TX | |
| 972-453 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | DLFTWTARPT | TX | |
| 972-454 | 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.