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 |
|---|---|---|---|---|---|
| 972-616 | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 7516 | DALLAS | TX | |
| 972-617 | SOUTHWESTERN BELL | 9533 | RED OAK | TX | |
| 972-618 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-619 | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | DALLAS | TX | |
| 972-620 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-621 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-622 | SPOK, INC. | 6630 | GRANDPRARI | TX | |
| 972-623 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-624 | SOUTHWESTERN BELL | 9533 | FRISCO | TX | |
| 972-625 | SOUTHWESTERN BELL | 9533 | FRISCO | TX | |
| 972-627 | VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW | 1181 | AVALON | TX | |
| 972-628 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-629 | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | DALLAS | TX | |
| 972-630 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-631 | AMERICAN MESSAGING SERVICES, LLC | 9748 | MCKINNEY | TX | |
| 972-632 | ONVOY, LLC - TX | 903C | MCKINNEY | TX | |
| 972-633 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-635 | SOUTHWESTERN BELL | 9533 | ROYSE CITY | TX | |
| 972-636 | SOUTHWESTERN BELL | 9533 | ROYSE CITY | TX | |
| 972-637 | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 7516 | CEDAR HILL | TX | |
| 972-641 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-642 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-643 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-644 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-646 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | BARDWELL | TX | |
| 972-647 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-648 | AMERICAN MESSAGING SERVICES, LLC | 9748 | GRANDPRARI | TX | |
| 972-649 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ALLEN | TX | |
| 972-650 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-651 | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | ROCKWALL | TX | |
| 972-652 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-653 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-655 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-656 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DALLAS | TX | |
| 972-657 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-658 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MCKINNEY | TX | |
| 972-659 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-660 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-661 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-662 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | CARROLLTON | TX | |
| 972-663 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-664 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-665 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLANO | TX | |
| 972-666 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2154 | BRISTOL | TX | |
| 972-667 | SPOK, INC. | 6630 | GRANDPRARI | TX | |
| 972-668 | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | FRISCO | TX | |
| 972-669 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-670 | T-MOBILE USA, INC. | 6529 | GRANDPRARI | TX | |
| 972-671 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-672 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | GRANDPRARI | 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.