NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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, all time — NPA 575
QWEST CORPORATION 77
ONVOY, LLC - NM 54
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 51
T-MOBILE USA, INC. 37
NEW CINGULAR WIRELESS PCS, LLC - IL 37
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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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 575-303 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F RATON NM
— 575-305 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NM 206F SNA TERESA NM
— 575-308 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARTESIA NM
— 575-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT NM
— 575-336 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 ALTO NM
— 575-337 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 HOBBS NM
— 575-347 1XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 ROSWELL NM
— 575-354 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 CAPITAN NM
— 575-355 not yet reported which blocks → E.N.M.R. TEL COOP 2262 FORTSUMNER NM
— 575-356 not yet reported which blocks → QWEST CORPORATION 9636 PORTALES NM
— 575-357 not yet reported which blocks → E.N.M.R. TEL COOP 2262 GRADY NM
— 575-358 not yet reported which blocks → VALLEY TEL COOP INC 2176 VIRDEN NM
— 575-359 5XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 PORTALES NM
— 575-364 not yet reported which blocks → PENASCO VALLEY TEL. COOP., INC. 2270 COTTONWOOD NM
— 575-365 not yet reported which blocks → PENASCO VALLEY TEL. COOP., INC. 2270 COTTONWOOD NM
— 575-369 not yet reported which blocks → LEACO RURAL TELEPHONE COOPERATIVE, INC. DBA LEACO 3798 HOBBS NM
— 575-370 not yet reported which blocks → LEACO RURAL TELEPHONE COOPERATIVE, INC. DBA LEACO 3798 HOBBS NM
— 575-372 not yet reported which blocks → E.N.M.R. TEL COOP 2262 WEBER CITY NM
— 575-373 5XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-374 not yet reported which blocks → E.N.M.R. TEL COOP 2262 CLAYTON NM
— 575-375 not yet reported which blocks → BACA VALLEY TEL. CO., INC. 2259 MAXWELL NM
— 575-376 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 CIMARRON NM
— 575-377 5XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 ANGEL FIRE NM
— 575-378 3XXX which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 RUIDOSODWN NM
— 575-382 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-387 not yet reported which blocks → LA JICARITA RURAL TEL. COOP., INC. 2263 MORA NM
— 575-388 not yet reported which blocks → QWEST CORPORATION 9636 SILVERCITY NM
— 575-389 not yet reported which blocks → E.N.M.R. TEL COOP 2262 PLEASANTHL NM
— 575-390 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOBBS NM
— 575-391 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 HOBBS NM
— 575-392 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 HOBBS NM
— 575-393 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 HOBBS NM
— 575-394 8XXX which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 EUNICE NM
— 575-395 6XXX7XXX which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 JAL NM
— 575-396 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 LOVINGTON NM
— 575-397 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 HOBBS NM
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.