NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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 317
INDIANA BELL TEL CO INC 297
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
— 317-872 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-873 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 ZIONSVILLE IN
— 317-874 5XXX6XXX7XXX8XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-875 1XXX2XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-876 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-879 5XXX6XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-881 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-882 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-883 6XXX7XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-884 6XXX7XXX8XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-885 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-887 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-888 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-889 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-890 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-891 4XXX5XXX which blocks → INDIANA BELL TEL CO INC 9325 CUMBERLAND IN
— 317-894 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CUMBERLAND IN
— 317-895 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-897 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-898 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-899 9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-913 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-915 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-916 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-917 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-920 9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-921 6XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-923 9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-924 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-925 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-926 8XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-927 5XXX8XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-929 1XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-931 8XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-936 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → INDIANA BELL TEL CO INC 9325 CHARLOTSVL IN
— 317-937 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-940 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-941 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-951 3XXX6XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-952 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 XXXXXXXXXX IN
— 317-955 5XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-956 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-971 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-972 9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-974 9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-977 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-988 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.