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 970
QWEST CORPORATION 189
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
— 970-728 not yet reported which blocks → QWEST CORPORATION 9636 TELLURIDE CO
— 970-736 3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 OAK CREEK CO
— 970-737 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9636 GILCREST CO
— 970-748 not yet reported which blocks → QWEST CORPORATION 9636 VAIL CO
— 970-752 not yet reported which blocks → QWEST CORPORATION 9636 DILLON CO
— 970-785 3XXX5XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 PLATTEVL CO
— 970-824 not yet reported which blocks → QWEST CORPORATION 9636 CRAIG CO
— 970-826 7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 CRAIG CO
— 970-827 2XXX3XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 VAIL CO
— 970-834 3XXX6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 EATON CO
— 970-842 7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 BRUSH CO
— 970-845 not yet reported which blocks → QWEST CORPORATION 9636 VAIL CO
— 970-847 2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 HILLROSE CO
— 970-858 not yet reported which blocks → QWEST CORPORATION 9636 FRUITA CO
— 970-867 not yet reported which blocks → QWEST CORPORATION 9636 FORTMORGAN CO
— 970-870 not yet reported which blocks → QWEST CORPORATION 9636 STEAMBOSPG CO
— 970-871 not yet reported which blocks → QWEST CORPORATION 9636 STEAMBOSPG CO
— 970-874 not yet reported which blocks → QWEST CORPORATION 9636 DELTA CO
— 970-875 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 STEAMBOSPG CO
— 970-876 3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 SILT CO
— 970-878 6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 MEEKER CO
— 970-879 not yet reported which blocks → QWEST CORPORATION 9636 STEAMBOSPG CO
— 970-884 3XXX which blocks → QWEST CORPORATION 9636 BAYFIELD CO
— 970-885 7XXX which blocks → QWEST CORPORATION 9631 SO BIG SPG CO
— 970-887 6XXX which blocks → QWEST CORPORATION 9636 GRANBY CO
— 970-920 not yet reported which blocks → QWEST CORPORATION 9636 ASPEN CO
— 970-922 3XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 ASPEN CO
— 970-923 not yet reported which blocks → QWEST CORPORATION 9636 ASPEN CO
— 970-925 not yet reported which blocks → QWEST CORPORATION 9636 ASPEN CO
— 970-927 not yet reported which blocks → QWEST CORPORATION 9636 BASALT CO
— 970-928 not yet reported which blocks → QWEST CORPORATION 9636 GLENWD SPG CO
— 970-943 not yet reported which blocks → QWEST CORPORATION 9636 GUNNISON CO
— 970-945 not yet reported which blocks → QWEST CORPORATION 9636 GLENWD SPG CO
— 970-947 not yet reported which blocks → QWEST CORPORATION 9636 GLENWD SPG CO
— 970-949 not yet reported which blocks → QWEST CORPORATION 9636 VAIL CO
— 970-962 8XXX which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-963 not yet reported which blocks → QWEST CORPORATION 9636 CARBONDALE CO
— 970-968 4XXX5XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 DILLON CO
— 970-984 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 NEW CASTLE CO

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.