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 254
T-MOBILE USA, INC. 30
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
2025-09-23 254-606 0XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 CAMERON TX
2025-04-08 254-975 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CAMERON TX
2025-01-29 254-997 0XXX1XXX2XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 NOLANVILLE TX
2024-11-11 254-586 9XXX which blocks → T-MOBILE USA, INC. 6529 MARLIN TX
2024-10-21 254-941 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CAMERON TX
2023-10-17 254-538 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MARLIN TX
2023-01-06 254-281 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
2021-09-20 254-450 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MARLIN TX
2020-11-17 254-419 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
2020-09-04 254-408 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 COPPERASCV TX
2020-01-28 254-370 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
2016-03-22 254-278 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 COPPERASCV TX
2008-03-18 254-350 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
2007-09-04 254-251 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
2006-05-22 254-768 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
2005-06-23 254-415 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
2002-01-14 254-733 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 WACO TX
2001-09-21 254-238 0XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 COPPERASCV TX
2001-07-24 254-413 1XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 STEPHENVL TX
2001-01-15 254-466 0XXX which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
— 254-214 7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 WACO TX
— 254-338 none assigned yet which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
— 254-371 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COPPERASCV TX
— 254-421 5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 TEMPLE TX
— 254-426 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MARLIN TX
— 254-458 not yet reported which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
— 254-462 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
— 254-535 8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
— 254-592 0XXX which blocks → T-MOBILE USA, INC. 6529 STEPHENVL TX
— 254-624 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 TEMPLE 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.