NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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 712
T-MOBILE USA, INC. 17
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
2025-06-12 712-554 0XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 LAKE PARK IA
2022-02-16 712-952 2XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 OTO IA
2018-03-16 712-699 0XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WALL LAKE IA
2018-03-09 712-381 3XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROCKRAPIDS IA
2018-03-08 712-538 1XXX2XXX4XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 POCAHONTAS IA
2018-03-08 712-798 1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 GEORGE IA
2018-03-02 712-686 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SCRANTON IA
2018-02-12 712-509 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SIOUX CITY IA
2009-03-31 712-904 2XXX5XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 AKRON IA
2007-12-11 712-578 1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 HULL IA
2006-01-09 712-577 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SIOUX CITY IA
2005-08-08 712-797 not yet reported which blocks → T-MOBILE USA, INC. 6529 WALL LAKE IA
2002-10-02 712-346 0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SPENCER IA
2001-04-09 712-203 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SIOUX CITY IA
— 712-204 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SIOUX CITY IA
— 712-301 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 SIOUX CITY IA
— 712-626 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 PRIMGHAR IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.