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
— 206-770 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-772 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-780 not yet reported which blocks → QWEST CORPORATION 9638 BAINBDG IS WA
— 206-781 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-782 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-783 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-784 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-788 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-789 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-797 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-808 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-824 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 206-835 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-839 6XXX7XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-842 not yet reported which blocks → QWEST CORPORATION 9638 BAINBDG IS WA
— 206-855 3XXX5XXX6XXX which blocks → QWEST CORPORATION 9638 BAINBDG IS WA
— 206-860 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-861 2XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-870 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 206-878 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 206-897 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-901 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-903 none assigned yet which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-906 9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-913 1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-923 7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-925 0XXX1XXX2XXX3XXX · 3 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-932 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-933 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-935 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-937 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-938 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-956 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-965 0XXX1XXX5XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-969 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-982 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-985 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-988 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-991 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-993 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-995 8XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-997 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-998 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.