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 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
— 801-644 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-645 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-651 4XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-661 6XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-668 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-671 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-674 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-675 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-680 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-690 4XXX5XXX6XXX7XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-706 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-739 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-750 4XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-755 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-787 not yet reported which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-792 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-808 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-809 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-814 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-815 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-831 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-835 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-856 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-859 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-860 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-864 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-865 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-867 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-879 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-897 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-898 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-915 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-916 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-918 2XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-920 2XXX which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-921 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-940 3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-941 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-949 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-953 0XXX1XXX2XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-979 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT

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.