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 206
QWEST CORPORATION 243
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
— 206-598 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-599 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-613 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-615 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-621 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-622 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-623 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-624 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-625 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-626 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-628 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-632 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-633 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-634 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-652 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-654 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-658 2XXX3XXX5XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-667 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-675 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-682 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-684 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-685 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-689 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-691 8XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-692 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-706 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-709 5XXX6XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-716 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-720 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-721 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-722 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-723 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-725 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-726 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-727 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-728 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-729 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-731 7XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-732 4XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-733 0XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-748 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-749 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-757 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-760 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-762 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-763 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-764 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-766 0XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-767 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-768 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE 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.