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 509
T-MOBILE USA, INC. 63
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
2026-01-08 509-718 9XXX which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2025-08-19 509-708 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2024-06-08 509-617 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2022-10-19 509-273 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2022-10-03 509-296 0XXX1XXX2XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PULLMAN WA
2021-11-17 509-986 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2021-04-16 509-712 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SUNNYSIDE WA
2021-03-02 509-610 0XXX1XXX2XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 COLFAX WA
2021-02-16 509-516 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WALLAWALLA WA
2021-01-11 509-517 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
2020-10-27 509-512 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MOSES LAKE WA
2020-07-09 509-504 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
2016-10-07 509-405 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2016-06-10 509-907 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
2016-04-29 509-608 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
2016-03-23 509-596 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CLARKSTON WA
2013-09-13 509-919 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
2013-07-23 509-212 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2012-05-03 509-424 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
2011-03-07 509-759 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
2009-05-27 509-440 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2008-03-06 509-730 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WALLAWALLA WA
2008-02-21 509-415 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WENATCHEE WA
2003-06-18 509-387 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 WENATCHEE WA
2003-02-20 509-205 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2002-06-10 509-438 none assigned yet which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2001-09-28 509-460 2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2001-09-28 509-741 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WENATCHEE WA
2001-08-31 509-294 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
2001-07-11 509-312 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
— 509-200 none assigned yet which blocks → T-MOBILE USA, INC. 6529 WALLAWALLA WA
— 509-230 not yet reported which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-251 7XXX which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-263 1XXX2XXX3XXX which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-270 4XXX which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-289 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 EPHRATA WA
— 509-303 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 PROSSER WA
— 509-304 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CLE ELUM WA
— 509-305 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 SUNNYSIDE WA
— 509-307 none assigned yet which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
— 509-308 none assigned yet which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
— 509-310 1XXX2XXX3XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 WH SALMON WA
— 509-342 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-361 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MOSES LAKE WA
— 509-370 8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-391 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SUNNYSIDE WA
— 509-428 2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 RITZVILLE WA
— 509-432 0XXX2XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PULLMAN WA
— 509-475 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-550 0XXX1XXX2XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 NEWPORT WA

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.