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
— 801-567 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-568 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-569 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-570 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-571 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-572 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-575 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-576 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-578 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-579 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-581 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-582 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-583 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-584 9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-585 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-586 not yet reported which blocks → QWEST CORPORATION 9636 CLEARFIELD UT
— 801-587 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-588 9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-591 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-593 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-594 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-595 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-596 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-612 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-614 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 CLEARFIELD UT
— 801-619 5XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-620 0XXX which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-621 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-622 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-624 0XXX6XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-625 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-626 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-627 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-629 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-632 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-639 0XXX1XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-670 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-685 1XXX3XXX which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-689 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-693 1XXX4XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 BOUNTIFUL UT
— 801-714 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-715 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-722 4XXX5XXX8XXX9XXX which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-724 1XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-728 not yet reported which blocks → QWEST CORPORATION 9636 CLEARFIELD UT
— 801-731 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-732 5XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-733 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-737 6XXX which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-741 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.