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 479
T-MOBILE USA, INC. 27
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
2023-02-03 479-492 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 GREENWOOD AR
2022-11-18 479-491 0XXX1XXX2XXX4XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CLARKSVL AR
2022-08-24 479-490 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ALMA AR
2020-11-11 479-405 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROGERS AR
2018-10-15 479-352 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ALMA AR
2018-10-15 479-370 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALMA AR
2018-03-29 479-337 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROGERS AR
2018-03-21 479-332 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 FAYETTEVL AR
2018-03-21 479-334 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 SPRINGDALE AR
2018-03-14 479-329 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALMA AR
2013-10-03 479-312 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALMA AR
2011-10-10 479-218 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 FORT SMITH AR
2011-06-02 479-237 0XXX1XXX2XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 RUSSELLVL AR
2011-04-25 479-800 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 FAYETTEVL AR
2010-07-19 479-358 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 FORT SMITH AR
2008-07-23 479-301 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 FAYETTEVL AR
2008-07-22 479-274 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 FORT SMITH AR
2002-01-24 479-599 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 SILOAM SPG AR
2001-10-23 479-799 0XXX2XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 FAYETTEVL AR
— 479-283 none assigned yet which blocks → T-MOBILE USA, INC. 6529 FAYETTEVL AR
— 479-285 none assigned yet which blocks → T-MOBILE USA, INC. 6529 FORT SMITH AR
— 479-357 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 GREENWOOD AR
— 479-420 2XXX which blocks → T-MOBILE USA, INC. 6529 FORT SMITH AR
— 479-435 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 FAYETTEVL AR
— 479-567 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 RUSSELLVL AR
— 479-685 2XXX which blocks → T-MOBILE USA, INC. 6529 BENTONVL AR
— 479-769 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 FORT SMITH AR

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.