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 801
QWEST CORPORATION 327
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 801-370 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-371 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-373 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-374 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-375 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-377 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-378 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-379 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-387 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-392 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-393 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-394 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-395 4XXX which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-397 not yet reported which blocks → QWEST CORPORATION 9636 BOUNTIFUL UT
— 801-398 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-399 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-402 not yet reported which blocks → QWEST CORPORATION 9636 FARMINGTON UT
— 801-408 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-412 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-418 9XXX which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-423 5XXX which blocks → QWEST CORPORATION 9636 SPANIHFORK UT
— 801-424 5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-426 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-429 9XXX which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-431 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-434 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-442 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-444 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-445 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-446 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-447 0XXX1XXX2XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 FARMINGTON UT
— 801-451 not yet reported which blocks → QWEST CORPORATION 9636 FARMINGTON UT
— 801-452 1XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-453 5XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-461 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-462 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-463 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-464 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-465 not yet reported which blocks → QWEST CORPORATION 9636 PAYSON UT
— 801-466 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-467 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-468 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-470 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-474 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-475 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-476 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-479 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-480 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-481 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-482 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT

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.