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 509
QWEST CORPORATION 132
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
— 509-744 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-747 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-751 none assigned yet which blocks → QWEST CORPORATION 9638 CLARKSTON WA
— 509-754 not yet reported which blocks → QWEST CORPORATION 9638 EPHRATA WA
— 509-758 not yet reported which blocks → QWEST CORPORATION 9638 CLARKSTON WA
— 509-762 not yet reported which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-764 not yet reported which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-765 not yet reported which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-766 not yet reported which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-793 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-826 not yet reported which blocks → QWEST CORPORATION 9638 OMAK WA
— 509-835 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-838 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-843 4XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9638 POMEROY WA
— 509-846 3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 OMAK WA
— 509-852 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9638 CLE ELUM WA
— 509-891 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-892 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-893 5XXX which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-897 2XXX3XXX5XXX8XXX which blocks → QWEST CORPORATION 9638 WALLAWALLA WA
— 509-898 not yet reported which blocks → QWEST CORPORATION 9638 MOSES LAKE WA
— 509-921 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-922 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-923 3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9638 PATEROS WA
— 509-924 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-926 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-927 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-928 not yet reported which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-944 0XXX1XXX4XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-965 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-966 not yet reported which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-972 6XXX which blocks → QWEST CORPORATION 9638 YAKIMA WA

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.