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 516
SPOK, INC. 28
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
2001-05-09 516-245 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
2001-05-09 516-291 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN01 NY
2001-05-09 516-335 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
2001-05-09 516-525 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN01 NY
2001-05-09 516-947 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN02 NY
2001-05-09 516-975 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-230 not yet reported which blocks → SPOK, INC. 6630 BRENTWOOD NY
— 516-251 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-257 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-258 not yet reported which blocks → SPOK, INC. 6630 BRENTWOOD NY
— 516-275 not yet reported which blocks → SPOK, INC. 6630 BRENTWOOD NY
— 516-278 not yet reported which blocks → SPOK, INC. 6630 BRENTWOOD NY
— 516-290 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-332 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-339 not yet reported which blocks → SPOK, INC. 6630 BRENTWOOD NY
— 516-372 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-389 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-392 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-638 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN09 NY
— 516-645 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-648 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN08 NY
— 516-649 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN08 NY
— 516-657 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-793 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-839 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-891 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY
— 516-948 not yet reported which blocks → SPOK, INC. 6630 SELDEN NY
— 516-954 not yet reported which blocks → SPOK, INC. 6630 NASSAUZN05 NY

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.