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
— 917-205 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-218 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-219 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-223 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-233 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-240 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-241 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-247 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-248 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-249 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-252 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-253 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-255 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN08 NY
— 917-276 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-290 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-296 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-298 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-313 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-314 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-317 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-321 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-333 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-356 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-360 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-372 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-377 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-380 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-381 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-389 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-390 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-395 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-401 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-404 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN11 NY
— 917-413 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN08 NY
— 917-422 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-424 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-425 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-427 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-429 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN11 NY
— 917-430 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN11 NY
— 917-433 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-448 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-457 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-458 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-461 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN08 NY
— 917-462 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-469 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-481 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN08 NY
— 917-483 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-486 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 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.