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 660
GRAND RIVER MUTUAL TEL CO 36
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
— 660-244 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 PURDIN MO
— 660-286 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 LAREDO MO
— 660-326 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 DENVER MO
— 660-382 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 MERCER MO
— 660-425 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 BETHANY MO
— 660-426 none assigned yet which blocks → GRAND RIVER MUTUAL TEL CO 1888 BETHANY MO
— 660-439 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 NEWHAMPTON MO
— 660-448 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 GENTRY MO
— 660-485 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 SPICKARD MO
— 660-592 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 POWERSVL MO
— 660-639 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 CHULA MO
— 660-652 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 BARNARD MO
— 660-666 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 DARLINGTON MO
— 660-673 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 GALT MO
— 660-684 7XXX which blocks → GRAND RIVER MUTUAL TEL CO 1888 JAMESPORT MO
— 660-735 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 SODAVIS CY MO
— 660-748 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 PRINCETON MO
— 660-789 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 BRIMSON MO
— 660-793 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 LUCERNE MO
— 660-794 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 NEWTOWN MO
— 660-799 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 SHERIDAN MO
— 660-824 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 MT MORIAH MO
— 660-845 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 WASHITNCTR MO
— 660-867 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 EAGLEVILLE MO
— 660-872 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 RIDGEWAY MO
— 660-875 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 SO LINEVL MO
— 660-876 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 GILMANCITY MO
— 660-878 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 ANDOVER MO
— 660-893 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 CAINSVILLE MO
— 660-895 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 LINNEUS MO
— 660-937 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 RAVENWOOD MO
— 660-938 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 MEADVILLE MO
— 660-939 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 GRAHAM MO
— 660-944 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 CONCETNJCT MO
— 660-946 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 BROWNING MO
— 660-986 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 PARNELL MO

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.