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 917
SPOK, INC. 133
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
— 917-489 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-490 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-491 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-506 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-537 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-552 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-556 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-598 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN08 NY
— 917-610 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-614 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-616 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-632 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-641 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-644 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-646 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-649 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-706 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-707 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN08 NY
— 917-712 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-713 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-729 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-738 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-739 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-752 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-758 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-759 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-760 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-761 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-762 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-766 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-784 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-785 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-786 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-787 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-788 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-798 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-799 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-802 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-812 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-820 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-823 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-824 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-840 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN08 NY
— 917-844 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-845 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-850 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-851 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-857 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-866 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-867 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 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.