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 951
T-MOBILE USA, INC. 120
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
2026-03-11 951-832 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2025-12-17 951-810 0XXX9XXX which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2025-10-14 951-804 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 HEMT HEMT CA
2025-10-02 951-803 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2025-09-12 951-802 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2025-06-18 951-792 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2025-04-25 951-773 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CORONA CA
2025-04-08 951-771 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 WOODCREST CA
2025-03-21 951-762 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2024-10-09 951-745 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HEMT HEMT CA
2023-12-04 951-705 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2023-12-04 951-706 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WOODCREST CA
2023-12-04 951-709 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MURRIETA CA
2023-09-26 951-649 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2023-07-13 951-641 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 HEMT HEMT CA
2023-06-15 951-632 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 HEMT SNJC CA
2022-09-02 951-613 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2022-05-17 951-610 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2021-12-10 951-605 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WOODCREST CA
2021-11-18 951-604 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HEMT SNJC CA
2021-11-17 951-598 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-11-10 951-594 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2021-11-09 951-597 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CORONA CA
2021-09-22 951-627 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2021-04-12 951-629 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HEMT SNJC CA
2021-04-05 951-576 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WOODCREST CA
2021-04-05 951-580 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2021-02-19 951-578 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2020-12-16 951-564 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2020-09-28 951-557 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 TEMSCL CNY CA
2020-09-01 951-548 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2020-02-28 951-519 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 TEMSCL CNY CA
2020-01-10 951-480 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 HEMT HEMT CA
2019-03-28 951-503 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2018-12-24 951-477 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MURRIETA CA
2018-06-12 951-518 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2016-12-01 951-441 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2016-11-15 951-418 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2016-10-10 951-497 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2016-08-09 951-410 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2016-06-29 951-484 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 HEMT HEMT CA
2016-03-04 951-405 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2015-09-16 951-476 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2015-09-11 951-421 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2015-07-27 951-475 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 CORONA CA
2015-07-24 951-420 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2015-06-09 951-482 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CORONA CA
2015-04-13 951-464 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2015-03-20 951-772 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2015-03-11 951-447 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MURRIETA CA

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.