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
Aug 2026
Jul 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 972-560 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DALLAS | TX | |
| 972-561 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-562 | SOUTHWESTERN BELL | 9533 | MCKINNEY | TX | |
| 972-563 | SOUTHWESTERN BELL | 9533 | TERRELL | TX | |
| 972-564 | SOUTHWESTERN BELL | 9533 | FORNEY | TX | |
| 972-566 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-567 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | GRANDPRARI | TX | |
| 972-568 | SPOK, INC. | 6630 | MCKINNEY | TX | |
| 972-569 | SOUTHWESTERN BELL | 9533 | MCKINNEY | TX | |
| 972-570 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-571 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | GRANDPRARI | TX | |
| 972-572 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-573 | ONVOY, LLC - TX | 903C | IRVING | TX | |
| 972-574 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | DLFTWTARPT | TX | |
| 972-575 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-576 | SOUTHWESTERN BELL | 9533 | RED OAK | TX | |
| 972-577 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLANO | TX | |
| 972-578 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-579 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-580 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-581 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DALLAS | TX | |
| 972-582 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-583 | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | PLANO | TX | |
| 972-584 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-586 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | DLFTWTARPT | TX | |
| 972-587 | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | DALLAS | TX | |
| 972-588 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-590 | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 7516 | DALLAS | TX | |
| 972-591 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-592 | SPOK, INC. | 6630 | IRVING | TX | |
| 972-593 | SPOK, INC. | 6630 | IRVING | TX | |
| 972-594 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-595 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-596 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-599 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-601 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-602 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-603 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-604 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-605 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-606 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-607 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | IRVING | TX | |
| 972-608 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-609 | SPOK, INC. | 6630 | GRANDPRARI | TX | |
| 972-610 | SOUTHWESTERN BELL | 9533 | XXXXXXXXXX | TX | |
| 972-611 | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | TX | |
| 972-612 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | PLANO | TX | |
| 972-613 | SOUTHWESTERN BELL | 9533 | DALLAS | TX | |
| 972-614 | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX | |
| 972-615 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 4344 | DLFTWTARPT | 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.