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 253
QWEST CORPORATION 141
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
— 253-841 not yet reported which blocks → QWEST CORPORATION 9638 PUYALLUP WA
— 253-843 6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9638 ROY WA
— 253-845 not yet reported which blocks → QWEST CORPORATION 9638 PUYALLUP WA
— 253-846 not yet reported which blocks → QWEST CORPORATION 9638 GRAHAM WA
— 253-847 not yet reported which blocks → QWEST CORPORATION 9638 GRAHAM WA
— 253-848 not yet reported which blocks → QWEST CORPORATION 9638 PUYALLUP WA
— 253-850 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-852 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-854 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-856 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-859 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-862 not yet reported which blocks → QWEST CORPORATION 9638 SUMNER WA
— 253-863 not yet reported which blocks → QWEST CORPORATION 9638 SUMNER WA
— 253-864 not yet reported which blocks → QWEST CORPORATION 9638 PUYALLUP WA
— 253-872 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-874 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-875 not yet reported which blocks → QWEST CORPORATION 9638 GRAHAM WA
— 253-876 4XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-879 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-887 not yet reported which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-891 not yet reported which blocks → QWEST CORPORATION 9638 SUMNER WA
— 253-896 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-912 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-922 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-924 9XXX which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-925 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-926 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-927 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-931 not yet reported which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-934 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-939 not yet reported which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-941 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-942 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-943 6XXX which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-945 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-946 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-952 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-964 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-982 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-983 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-984 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA 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.