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
— 970-491 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-493 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-494 none assigned yet which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-495 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-496 not yet reported which blocks → QWEST CORPORATION 9636 DILLON CO
— 970-498 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-506 not yet reported which blocks → QWEST CORPORATION 9636 GREELEY CO
— 970-513 not yet reported which blocks → QWEST CORPORATION 9636 DILLON CO
— 970-521 not yet reported which blocks → QWEST CORPORATION 9636 STERLING CO
— 970-522 not yet reported which blocks → QWEST CORPORATION 9636 STERLING CO
— 970-523 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-526 6XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 STERLING CO
— 970-529 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 CORTEZ CO
— 970-532 not yet reported which blocks → QWEST CORPORATION 9636 BERTHOUD CO
— 970-533 2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 MANCOS CO
— 970-535 2XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 MEAD CO
— 970-542 5XXX7XXX which blocks → QWEST CORPORATION 9636 FORTMORGAN CO
— 970-544 not yet reported which blocks → QWEST CORPORATION 9636 ASPEN CO
— 970-547 6XXX which blocks → QWEST CORPORATION 9636 BRECKENRDG CO
— 970-564 3XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 CORTEZ CO
— 970-565 not yet reported which blocks → QWEST CORPORATION 9636 CORTEZ CO
— 970-568 2XXX5XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-577 6XXX which blocks → QWEST CORPORATION 9636 ESTES PARK CO
— 970-586 not yet reported which blocks → QWEST CORPORATION 9636 ESTES PARK CO
— 970-587 3XXX which blocks → QWEST CORPORATION 9636 JOHNSTMLKN CO
— 970-593 none assigned yet which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-613 3XXX which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-619 0XXX1XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-622 not yet reported which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-625 not yet reported which blocks → QWEST CORPORATION 9636 RIFLE CO
— 970-626 6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 RIDGWAY CO
— 970-627 4XXX6XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 GRAND LAKE CO
— 970-635 not yet reported which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-638 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 YAMPA CO
— 970-641 not yet reported which blocks → QWEST CORPORATION 9636 GUNNISON CO
— 970-642 3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 GUNNISON CO
— 970-645 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 WELDONA CO
— 970-662 none assigned yet which blocks → QWEST CORPORATION 9636 SOCHEYENNE CO
— 970-663 not yet reported which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-667 not yet reported which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-668 7XXX which blocks → QWEST CORPORATION 9636 DILLON CO
— 970-669 not yet reported which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-674 7XXX which blocks → QWEST CORPORATION 9636 WINDSOR CO
— 970-679 not yet reported which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-686 not yet reported which blocks → QWEST CORPORATION 9636 WINDSOR CO
— 970-704 5XXX6XXX8XXX which blocks → QWEST CORPORATION 9636 CARBONDALE CO
— 970-722 2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 FRASER CO
— 970-724 2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9636 KREMMLING CO
— 970-725 2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 HTSLPHRSPG CO
— 970-726 not yet reported which blocks → QWEST CORPORATION 9636 FRASER 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.