NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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
T-MOBILE USA, INC. 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
2025-07-22 575-344 4XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CANNON AFB NM
2024-09-12 575-328 0XXX1XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SILVERCITY NM
2024-01-23 575-316 9XXX which blocks → T-MOBILE USA, INC. 6529 TAOS NM
2022-02-28 575-295 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALAMOGORDO NM
2021-10-26 575-285 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALAMOGORDO NM
2021-09-01 575-284 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SILVERCITY NM
2021-08-03 575-277 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
2021-07-27 575-271 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CLOVIS NM
2021-05-06 575-260 0XXX1XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 RUIDOSODWN NM
2021-04-26 575-266 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 CARLSBAD NM
2020-06-16 575-240 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 TAOS NM
2013-04-05 575-404 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALAMOGORDO NM
2011-05-23 575-689 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CARLSBAD NM
2010-03-16 575-777 9XXX which blocks → T-MOBILE USA, INC. 6529 CLOVIS NM
2010-01-06 575-268 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 CLOVIS NM
2005-11-29 575-517 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SOCORRO NM
2004-11-19 575-497 9XXX which blocks → T-MOBILE USA, INC. 6529 TRUTHCQNCS NM
2004-11-12 575-602 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 HOBBS NM
2003-11-25 575-545 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DEMING NM
2003-06-23 575-815 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 TUCUMCARI NM
2003-06-03 575-418 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 SOCORRO NM
2001-10-12 575-704 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 LOVINGTON NM
2001-07-17 575-312 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
2001-07-17 575-317 0XXX2XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 ROSWELL NM
2001-07-17 575-318 0XXX2XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 HOBBS NM
2001-03-16 575-302 0XXX2XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CARLSBAD NM
— 575-231 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ARTESIA NM
— 575-308 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARTESIA NM
— 575-442 0XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALAMOGORDO 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
— 575-571 4XXX which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
— 575-621 not yet reported which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
— 575-650 not yet reported which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
— 575-693 0XXX2XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CLOVIS NM
— 575-993 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.