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
— 253-548 4XXX5XXX6XXX7XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-552 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-564 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-565 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-566 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-568 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-571 8XXX9XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-572 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-573 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-581 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-582 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-583 4XXX6XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-584 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-588 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-589 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-591 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-593 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-594 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-596 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-597 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-627 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-630 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-631 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-638 4XXX5XXX which blocks → QWEST CORPORATION 9638 KENT WA
— 253-639 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-657 none assigned yet which blocks → QWEST CORPORATION 9638 KENT WA
— 253-661 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-671 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-680 9XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-692 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-697 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 PUYALLUP WA
— 253-735 not yet reported which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-751 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-752 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-756 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-759 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-761 6XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-770 not yet reported which blocks → QWEST CORPORATION 9638 PUYALLUP WA
— 253-779 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-792 0XXX1XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-798 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-804 not yet reported which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-813 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-815 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-826 not yet reported which blocks → QWEST CORPORATION 9638 SUMNER WA
— 253-833 not yet reported which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-835 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-838 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-839 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-840 not yet reported which blocks → QWEST CORPORATION 9638 PUYALLUP 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.