NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
Download CSV ↓
Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 575-477 not yet reported which blocks → ROOSEVELT COUNTY RURAL TEL. COOP., INC. 2272 DORA NM
— 575-478 not yet reported which blocks → ROOSEVELT COUNTY RURAL TEL. COOP., INC. 2272 FLOYD NM
— 575-479 5XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 575-482 not yet reported which blocks → ROOSEVELT COUNTY RURAL TEL. COOP., INC. 2272 TEXICO NM
— 575-483 1XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 SPRINGER NM
— 575-484 not yet reported which blocks → PENASCO VALLEY TEL. COOP., INC. 2270 HOPE NM
— 575-485 not yet reported which blocks → E.N.M.R. TEL COOP 2262 ROY NM
— 575-487 not yet reported which blocks → E.N.M.R. TEL COOP 2262 LOGAN NM
— 575-491 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ALAMOGORDO NM
— 575-492 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 HOBBS NM
— 575-493 3XXX4XXX5XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LORDSBURG NM
— 575-495 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALAMOGORDO NM
— 575-496 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
— 575-502 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F SNA TERESA NM
— 575-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT NM
— 575-521 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-522 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-523 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-524 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-525 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-526 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-527 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-528 8XXX9XXX which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-531 not yet reported which blocks → VALLEY TEL COOP INC 2176 COLUMBUS NM
— 575-532 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-533 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 RESERVE NM
— 575-534 not yet reported which blocks → QWEST CORPORATION 9636 SILVERCITY NM
— 575-535 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 CLIFF NM
— 575-536 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 MIMBRES NM
— 575-537 1XXX which blocks → QWEST CORPORATION 9636 BAYARD NM
— 575-538 none assigned yet which blocks → QWEST CORPORATION 9636 SILVERCITY NM
— 575-539 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 GLENWOOD NM
— 575-541 3XXX which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-542 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 LORDSBURG NM
— 575-543 8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 DEMING NM
— 575-544 not yet reported which blocks → QWEST CORPORATION 9636 DEMING NM
— 575-546 not yet reported which blocks → QWEST CORPORATION 9636 DEMING NM
— 575-547 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 LUNA NM
— 575-548 not yet reported which blocks → VALLEY TEL COOP INC 2176 ANIMAS NM
— 575-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT NM
— 575-556 4XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-557 not yet reported which blocks → VALLEY TEL COOP INC 2176 RODEO NM
— 575-562 0XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 PORTALES NM
— 575-568 6XXX which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 LYBROOK NM
— 575-571 4XXX which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
— 575-572 not yet reported which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 575-574 none assigned yet which blocks → QWEST CORPORATION 9636 SILVERCITY NM
— 575-576 not yet reported which blocks → E.N.M.R. TEL COOP 2262 SAN JON NM
— 575-581 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 EL RITO NM
— 575-582 none assigned yet which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 VALLECITOS NM

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.