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 575
QWEST CORPORATION 77
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
— 575-637 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX which blocks → QWEST CORPORATION 9636 ROSWELL NM
— 575-645 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-646 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-647 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-678 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-679 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-737 1XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 TAOS NM
— 575-742 4XXX5XXX6XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 CLOVIS NM
— 575-746 none assigned yet which blocks → QWEST CORPORATION 9636 ARTESIA NM
— 575-748 none assigned yet which blocks → QWEST CORPORATION 9636 ARTESIA NM
— 575-751 none assigned yet which blocks → QWEST CORPORATION 9636 TAOS NM
— 575-754 0XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 RED RIVER NM
— 575-758 not yet reported which blocks → QWEST CORPORATION 9636 TAOS NM
— 575-762 not yet reported which blocks → QWEST CORPORATION 9636 CLOVIS NM
— 575-763 not yet reported which blocks → QWEST CORPORATION 9636 CLOVIS NM
— 575-769 not yet reported which blocks → QWEST CORPORATION 9636 CLOVIS NM
— 575-776 4XXX6XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 TAOS NM
— 575-784 not yet reported which blocks → QWEST CORPORATION 9636 CANNON AFB NM
— 575-791 0XXX1XXX3XXX5XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9636 CLOVIS NM
— 575-824 7XXX which blocks → QWEST CORPORATION 9636 CHAPARRAL NM
— 575-835 not yet reported which blocks → QWEST CORPORATION 9636 SOCORRO NM
— 575-838 not yet reported which blocks → QWEST CORPORATION 9636 SOCORRO NM
— 575-874 8XXX which blocks → QWEST CORPORATION 9636 SNA TERESA NM
— 575-882 not yet reported which blocks → QWEST CORPORATION 9636 ANTHONY NM
— 575-921 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 575-956 3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 SILVERCITY NM
— 575-997 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 SNA TERESA NM

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.