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 505
T-MOBILE USA, INC. 65
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
2025-05-28 505-580 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2024-10-24 505-638 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2024-01-11 505-601 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2023-07-18 505-572 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2022-09-30 505-542 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ESPANOLA NM
2022-09-30 505-868 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2022-09-20 505-532 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2022-05-27 505-523 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2022-03-10 505-464 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2021-12-10 505-519 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2021-05-04 505-481 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2021-03-11 505-457 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2021-02-03 505-451 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 LAS VEGAS NM
2020-12-17 505-447 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 GRANTS NM
2020-10-30 505-397 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2020-07-01 505-430 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2020-05-29 505-376 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ESPANOLA NM
2016-11-23 505-347 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2016-10-06 505-387 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2016-09-14 505-737 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2015-12-15 505-557 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SANTA FE NM
2015-08-28 505-910 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2015-07-23 505-544 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2015-02-23 505-297 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2015-01-22 505-585 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2014-10-22 505-485 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2014-05-21 505-339 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2014-02-24 505-289 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2013-12-16 505-267 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2013-06-27 505-219 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2010-08-24 505-399 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2010-03-19 505-225 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2007-05-09 505-906 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2007-03-02 505-592 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 FARMINGTON NM
2006-02-07 505-516 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 FARMINGTON NM
2005-12-14 505-901 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ESPANOLA NM
2005-10-05 505-608 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 FARMINGTON NM
2002-03-20 505-718 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 LAS VEGAS NM
2001-08-15 505-417 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2001-05-14 505-306 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
2001-05-14 505-409 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
— 505-310 6XXX which blocks → T-MOBILE USA, INC. 6529 SANTA FE NM
— 505-363 not yet reported which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
— 505-385 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
— 505-402 0XXX2XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 FARMINGTON NM
— 505-410 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
— 505-440 not yet reported which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
— 505-450 not yet reported which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
— 505-453 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE NM
— 505-459 not yet reported which blocks → T-MOBILE USA, INC. 6529 ALBUQURQUE 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.