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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 801-483 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-484 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-485 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-486 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-487 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-488 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-489 not yet reported which blocks → QWEST CORPORATION 9636 SPRINGVL UT
— 801-490 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-491 not yet reported which blocks → QWEST CORPORATION 9636 SPRINGVL UT
— 801-492 5XXX which blocks → QWEST CORPORATION 9636 AMERCNFORK UT
— 801-493 5XXX9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-495 4XXX5XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-496 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-497 none assigned yet which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-498 0XXX which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-501 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-507 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-508 2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-517 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-519 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-521 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-522 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-523 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-524 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-525 not yet reported which blocks → QWEST CORPORATION 9636 CLEARFIELD UT
— 801-526 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-530 9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-531 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-532 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-533 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-534 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-535 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-536 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-537 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-538 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-539 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-543 none assigned yet which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-544 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-545 4XXX7XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-546 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-547 none assigned yet which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-549 none assigned yet which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-551 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-552 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-553 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-561 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-562 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-563 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-565 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-566 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE 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.