NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
— 917-869 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-871 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-872 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-874 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-875 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-876 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-879 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-883 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-884 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-894 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-895 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN11 NY
— 917-896 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN11 NY
— 917-897 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-898 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-899 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-901 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-904 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-906 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-918 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-919 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-925 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-926 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-927 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-948 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-949 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-954 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-964 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-978 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-980 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-988 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-989 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-990 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-996 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.