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 925
T-MOBILE USA, INC. 44
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
2026-08-20 925-651 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WALNUT CRK CA
2026-01-06 925-554 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2025-06-25 925-545 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2024-06-21 925-539 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2024-01-19 925-538 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2023-08-16 925-205 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DANVILLE CA
2023-01-19 925-506 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2022-05-17 925-501 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2021-09-17 925-897 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DUBLN-SNRM CA
2021-04-05 925-445 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2020-10-15 925-489 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2019-01-18 925-477 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2017-03-23 925-503 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2016-08-30 925-436 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2015-09-22 925-204 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2013-04-19 925-428 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2002-09-20 925-913 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 BSHP RNCH CA
2002-09-20 925-914 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CLAYTON CA
2002-09-20 925-915 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DANVILLE CA
2002-09-20 925-917 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MARTINEZ CA
2002-09-20 925-922 3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PLEASANTON CA
2001-12-28 925-325 not yet reported which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2001-10-18 925-639 not yet reported which blocks → T-MOBILE USA, INC. 6529 WALNUT CRK CA
2001-09-19 925-577 2XXX which blocks → T-MOBILE USA, INC. 6529 DUBLN-SNRM CA
2001-07-17 925-567 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 CLAYTON CA
— 925-202 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PLEASANTON CA
— 925-209 2XXX which blocks → T-MOBILE USA, INC. 6529 PLEASANTON CA
— 925-300 3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WALNUT CRK CA
— 925-319 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 SUNOL CA
— 925-351 0XXX1XXX2XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PLEASANTON CA
— 925-352 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PLEASANTON CA
— 925-366 0XXX1XXX2XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PLEASANTON CA
— 925-367 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PLEASANTON CA
— 925-368 0XXX1XXX2XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PLEASANTON CA
— 925-382 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
— 925-435 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CONCORD CA
— 925-457 none assigned yet which blocks → T-MOBILE USA, INC. 6529 WALNUT CRK CA
— 925-528 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ORINDA CA
— 925-570 2XXX which blocks → T-MOBILE USA, INC. 6529 DUBLN-SNRM CA
— 925-580 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PLEASANTON CA
— 925-584 3XXX which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
— 925-623 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 PLEASANTON CA
— 925-766 none assigned yet which blocks → T-MOBILE USA, INC. 6529 WALNUT CRK CA
— 925-878 2XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 LAFAYETTE 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.