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 805
T-MOBILE USA, INC. 54
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
2024-05-31 805-661 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 VNTRA CNTL CA
2022-07-14 805-972 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LOMPOC CA
2022-02-28 805-891 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MOORPARK CA
2022-02-11 805-840 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ARROYOGRND CA
2021-05-04 805-859 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ATASCADERO CA
2018-04-16 805-670 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2018-03-22 805-519 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARROYOGRND CA
2018-01-18 805-424 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SIMIVALLEY CA
2016-08-12 805-554 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SANTAMARIA CA
2015-12-07 805-825 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ARROYOGRND CA
2015-09-22 805-397 0XXX1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2015-05-04 805-635 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PASOROBLES CA
2012-01-12 805-366 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2007-11-09 805-263 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2007-06-22 805-248 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2006-03-28 805-824 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2006-03-14 805-827 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2006-02-03 805-837 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SANBARBARA CA
2005-11-29 805-758 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2005-07-29 805-612 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2002-09-20 805-574 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 ARROYOGRND CA
2002-09-20 805-703 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 ATASCADERO CA
2002-03-22 805-325 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SANTA YNEZ CA
2002-02-21 805-295 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 PISMOBEACH CA
2002-02-21 805-296 1XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 PASOROBLES CA
2002-02-21 805-298 1XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MOORPARK CA
2002-01-28 805-268 1XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SANTAMARIA CA
2002-01-28 805-294 1XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 LOMPOC CA
2002-01-28 805-302 not yet reported which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2002-01-28 805-304 6XXX which blocks → T-MOBILE USA, INC. 6529 SIMIVALLEY CA
2001-12-28 805-300 6XXX which blocks → T-MOBILE USA, INC. 6529 THOUSAOAKS CA
2001-10-18 805-637 not yet reported which blocks → T-MOBILE USA, INC. 6529 SANBARBARA CA
2001-07-17 805-406 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SANTAMARIA CA
2001-04-23 805-284 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SANBARBARA CA
2001-04-19 805-409 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 THOUSAOAKS CA
— 805-200 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
— 805-205 0XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
— 805-236 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
— 805-259 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SANBARBARA CA
— 805-329 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SNLUSOBSPO CA
— 805-391 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ATASCADERO CA
— 805-431 6XXX which blocks → T-MOBILE USA, INC. 6529 SNLUSOBSPO CA
— 805-506 0XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 THOUSAOAKS CA
— 805-539 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ATASCADERO CA
— 805-732 none assigned yet which blocks → T-MOBILE USA, INC. 6529 THOUSAOAKS CA
— 805-822 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
— 805-857 7XXX which blocks → T-MOBILE USA, INC. 6529 THOUSAOAKS CA
— 805-896 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SANBARBARA CA
— 805-904 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARROYOGRND CA
— 805-905 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 THOUSAOAKS CA

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.