NumberResearchRecent prefix assignments
369 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/18/2026
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 |
|---|---|---|---|---|---|
| 314-523 | SOUTHWESTERN BELL | 9533 | CREVECOEUR | MO | |
| 314-524 | SOUTHWESTERN BELL | 9533 | LADUE | MO | |
| 314-525 | SOUTHWESTERN BELL | 9533 | SAPPINGTON | MO | |
| 314-527 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | LADUE | MO | |
| 314-529 | SOUTHWESTERN BELL | 9533 | CREVECOEUR | MO | |
| 314-531 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-533 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-534 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-535 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-537 | T-MOBILE USA, INC. | 6529 | ST LOUIS | MO | |
| 314-538 | SOUTHWESTERN BELL | 9533 | LADUE | MO | |
| 314-539 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-540 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | KIRKWOOD | MO | |
| 314-541 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | KIRKWOOD | MO | |
| 314-542 | SOUTHWESTERN BELL | 9533 | CREVECOEUR | MO | |
| 314-543 | SOUTHWESTERN BELL | 9533 | SAPPINGTON | MO | |
| 314-544 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-545 | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | LADUE | MO | |
| 314-548 | AT&T - LOCAL | 7421 | CREVECOEUR | MO | |
| 314-549 | LEVEL 3 COMMUNICATIONS, LLC - MO | 4932 | OAKVILLE | MO | |
| 314-550 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | KIRKWOOD | MO | |
| 314-551 | SOUTHWESTERN BELL | 9533 | LADUE | MO | |
| 314-552 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-553 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-554 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-555 | MULTIPLE OCN LISTING | MULT | DIR ASST | MO | |
| 314-558 | LEVEL 3 COMMUNICATIONS, LLC - MO | 4932 | ST LOUIS | MO | |
| 314-559 | AMERICAN MESSAGING SERVICES, LLC | 9748 | ST LOUIS | MO | |
| 314-560 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | KIRKWOOD | MO | |
| 314-562 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LADUE | MO | |
| 314-563 | LEVEL 3 COMMUNICATIONS, LLC - MO | 4932 | LADUE | MO | |
| 314-564 | T-MOBILE USA, INC. | 6529 | LADUE | MO | |
| 314-565 | T-MOBILE USA, INC. | 6529 | ST LOUIS | MO | |
| 314-567 | SOUTHWESTERN BELL | 9533 | LADUE | MO | |
| 314-568 | T-MOBILE USA, INC. | 6529 | CREVECOEUR | MO | |
| 314-569 | SOUTHWESTERN BELL | 9533 | LADUE | MO | |
| 314-570 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | KIRKWOOD | MO | |
| 314-571 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-572 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-574 | T-MOBILE USA, INC. | 6529 | ST LOUIS | MO | |
| 314-575 | T-MOBILE USA, INC. | 6529 | CREVECOEUR | MO | |
| 314-576 | SOUTHWESTERN BELL | 9533 | CREVECOEUR | MO | |
| 314-577 | SOUTHWESTERN BELL | 9533 | ST LOUIS | MO | |
| 314-578 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | KIRKWOOD | MO | |
| 314-579 | SOUTHWESTERN BELL | 9533 | CREVECOEUR | MO | |
| 314-580 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 5814 | LADUE | MO | |
| 314-581 | T-MOBILE USA, INC. | 6529 | CREVECOEUR | MO | |
| 314-583 | T-MOBILE USA, INC. | 6529 | ST LOUIS | MO | |
| 314-584 | ONVOY, LLC - MO | 093F | ST LOUIS | MO | |
| 314-587 | SOUTHWESTERN BELL | 9533 | LADUE | MO |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/18/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.