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
SPOK, INC. 23
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
2001-01-23 206-560 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-314 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-534 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-540 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-541 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-559 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-563 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-642 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-645 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-663 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-680 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-810 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-907 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-916 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-917 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-955 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-977 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-978 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-980 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-986 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-989 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-994 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-996 not yet reported which blocks → SPOK, INC. 6630 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.