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 903
T-MOBILE USA, INC. 35
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
2014-11-11 903-426 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 TYLER TX
2010-05-11 903-787 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TYLER TX
2009-08-18 903-336 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TEXARKANA TX
2002-11-07 903-933 0XXX3XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DEKALB TX
2002-10-30 903-370 2XXX3XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WASKOM TX
2001-06-15 903-503 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MARSHALL TX
2001-06-15 903-830 2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 TYLER TX
2001-05-08 903-215 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LONGVIEW TX
2001-01-25 903-332 4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PARIS TX
2001-01-23 903-491 0XXX which blocks → T-MOBILE USA, INC. 6529 DETROIT TX
2001-01-18 903-517 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PARIS TX
2001-01-05 903-319 0XXX2XXX3XXX7XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 HOOKS TX
— 903-220 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 LONGVIEW TX
— 903-240 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LONGVIEW TX
— 903-272 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PARIS TX
— 903-275 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ATHENS TX
— 903-288 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ATHENS TX
— 903-352 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 TYLER TX
— 903-355 2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 GREENVILLE TX
— 903-357 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SHERMAN TX
— 903-376 0XXX2XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MINEOLA TX
— 903-422 2XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 GREENVILLE TX
— 903-423 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 GREENVILLE TX
— 903-466 0XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MT VERNON TX
— 903-508 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 TYLER TX
— 903-557 2XXX3XXX4XXX5XXX6XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 LONGVIEW TX
— 903-618 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 OWENTOWN TX
— 903-635 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LONGVIEW TX
— 903-651 0XXX2XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 WHITESBORO TX
— 903-691 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 TEXARKANA TX
— 903-742 4XXX5XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MARSHALL TX
— 903-744 1XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SHERMAN TX
— 903-749 6XXX7XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 TYLER TX
— 903-819 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SHERMAN TX
— 903-851 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CORSICANA TX

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.