NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
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
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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 575-398 not yet reported which blocks → LEACO RURAL TEL. COOP., INC. 2264 TATUM NM
— 575-399 not yet reported which blocks → LEACO RURAL TELEPHONE COOPERATIVE, INC. DBA LEACO 3798 HOBBS NM
— 575-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT NM
— 575-416 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ROSWELL NM
— 575-420 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ROSWELL NM
— 575-421 not yet reported which blocks → E.N.M.R. TEL COOP 2262 EL VALLE NM
— 575-422 not yet reported which blocks → E.N.M.R. TEL COOP 2262 WHITELAKES NM
— 575-423 not yet reported which blocks → E.N.M.R. TEL COOP 2262 BINGHAM NM
— 575-427 not yet reported which blocks → E.N.M.R. TEL COOP 2262 ANTONCHICO NM
— 575-430 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ALAMOGORDO NM
— 575-433 not yet reported which blocks → LEACO RURAL TELEPHONE COOPERATIVE, INC. DBA LEACO 3798 HOBBS NM
— 575-434 not yet reported which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 575-436 not yet reported which blocks → VALLEY TEL COOP INC 2176 PLAYAS NM
— 575-437 not yet reported which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 575-439 none assigned yet which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 575-442 0XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALAMOGORDO NM
— 575-443 none assigned yet which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 575-445 not yet reported which blocks → QWEST CORPORATION 9636 RATON NM
— 575-446 0XXX1XXX2XXX3XXX4XXX6XXX · 4 holders which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 575-447 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RATON NM
— 575-451 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 KENTON NM
— 575-456 not yet reported which blocks → E.N.M.R. TEL COOP 2262 BELLVIEW NM
— 575-457 not yet reported which blocks → PENASCO VALLEY TEL. COOP., INC. 2270 LAKEWOOD NM
— 575-458 not yet reported which blocks → E.N.M.R. TEL COOP 2262 RAGLAND NM
— 575-461 not yet reported which blocks → QWEST CORPORATION 9636 TUCUMCARI NM
— 575-464 not yet reported which blocks → MESCALERO APACHE TELECOM, INC. - NM 1231 MESCALERO NM
— 575-472 not yet reported which blocks → E.N.M.R. TEL COOP 2262 SANTA ROSA NM
— 575-475 not yet reported which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.