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 425
T-MOBILE USA, INC. 91
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
2026-01-08 425-592 0XXX1XXX2XXX3XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2025-10-23 425-575 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2025-09-19 425-574 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2025-07-14 425-568 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2024-10-11 425-325 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2024-08-30 425-570 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 HALLS LAKE WA
2023-01-27 425-472 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2022-10-19 425-384 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2022-08-18 425-547 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 RENTON WA
2022-07-14 425-540 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2022-03-08 425-548 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2022-03-01 425-543 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2022-01-27 425-542 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2021-12-14 425-545 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 RENTON WA
2021-10-28 425-370 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2021-10-04 425-340 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ISSAQUAH WA
2021-09-22 425-469 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2021-04-24 425-534 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HALLS LAKE WA
2021-02-25 425-517 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 RENTON WA
2021-01-15 425-364 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2020-12-22 425-494 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ISSAQUAH WA
2020-12-21 425-520 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-10-22 425-470 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2020-09-29 425-532 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-08-27 425-371 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2020-01-09 425-465 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ISSAQUAH WA
2019-09-30 425-521 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2019-09-03 425-439 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2019-04-25 425-436 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-01-31 425-515 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2018-11-13 425-428 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ISSAQUAH WA
2018-08-15 425-389 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2018-04-10 425-624 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2016-11-30 425-382 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2016-11-14 425-589 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2016-08-31 425-362 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2016-05-12 425-240 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2015-10-15 425-365 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2014-10-20 425-287 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2014-09-23 425-595 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2014-08-29 425-499 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2014-06-27 425-229 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2014-03-06 425-326 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2013-04-15 425-209 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2012-10-18 425-435 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2011-02-02 425-623 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2010-09-20 425-633 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2002-05-14 425-328 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2001-10-11 425-518 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2001-04-16 425-343 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA

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.