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 206
T-MOBILE USA, INC. 95
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
2025-01-09 206-807 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2024-11-01 206-843 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2024-09-16 206-699 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2024-08-30 206-610 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 RICHMNDBCH WA
2024-08-06 206-609 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2023-11-20 206-608 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 RICHMNDBCH WA
2022-01-07 206-746 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2021-11-03 206-791 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2021-09-27 206-756 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2021-08-17 206-710 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2021-06-17 206-532 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2019-09-30 206-586 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2019-08-20 206-537 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2019-05-20 206-591 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2019-01-23 206-530 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2018-09-20 206-665 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2017-03-13 206-751 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2016-11-21 206-503 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2016-08-10 206-698 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2016-05-24 206-483 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2016-03-07 206-771 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2015-11-06 206-899 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2015-09-25 206-960 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2015-08-27 206-637 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2015-03-12 206-822 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2014-10-09 206-488 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2014-09-08 206-468 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2014-03-28 206-294 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2013-10-31 206-939 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2013-08-01 206-981 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2012-12-20 206-489 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2012-10-04 206-549 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2011-08-09 206-535 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2008-05-13 206-458 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2007-08-15 206-453 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2007-04-26 206-446 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2007-03-29 206-631 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-226 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-227 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-228 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-229 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-234 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-235 not yet reported which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-250 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-251 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-255 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-261 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-271 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-280 2XXX which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-290 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE 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.