NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 801
T-MOBILE USA, INC. 91
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
2024-02-14 801-385 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MURRAY UT
2011-12-20 801-919 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2011-05-03 801-600 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
2011-05-03 801-800 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2011-02-22 801-900 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2011-01-31 801-970 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2011-01-19 801-500 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2010-12-23 801-875 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2010-12-23 801-960 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2010-12-21 801-888 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2010-03-30 801-903 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2010-02-23 801-882 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2007-10-25 801-425 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2007-07-18 801-513 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2007-06-25 801-512 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2007-04-27 801-793 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2007-04-09 801-615 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2007-02-27 801-833 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2002-11-14 801-830 not yet reported which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2001-11-14 801-836 not yet reported which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2001-09-18 801-608 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2001-08-15 801-716 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MURRAY UT
2001-07-17 801-628 not yet reported which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2001-05-04 801-330 9XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-259 4XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-301 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MURRAY UT
— 801-309 2XXX which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
— 801-318 1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-358 2XXX which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-381 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-390 2XXX which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
— 801-400 3XXX4XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-403 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-404 2XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-414 2XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-420 8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-458 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-471 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-472 0XXX1XXX2XXX3XXX5XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-473 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-502 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-509 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MURRAY UT
— 801-514 7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MURRAY UT
— 801-529 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
— 801-564 4XXX6XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-574 0XXX1XXX2XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-602 0XXX1XXX2XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-634 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-635 1XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-636 4XXX which blocks → T-MOBILE USA, INC. 6529 PROVO UT

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.