NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 317
OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 1
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
— 317-853 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J CARMEL IN
— 317-856 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 WESTNEWTON IN
— 317-857 0XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 WESTNEWTON IN
— 317-858 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 BROWNSBURG IN
— 317-859 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-860 not yet reported which blocks → PAETEC ITEL, LLC 829J INDIANAPLS IN
— 317-861 7XXX which blocks → INDIANA BELL TEL CO INC 9325 NEWPALSTIN IN
— 317-862 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 ACTON IN
— 317-863 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J FISHERS IN
— 317-865 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-866 not yet reported which blocks → HANCOCK COMMUNICATIONS, INC. - IN 7459 CUMBERLAND IN
— 317-867 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 WESTFIELD IN
— 317-869 2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-870 1XXX3XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-871 1XXX4XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 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
— 317-877 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 WESTFIELD IN
— 317-878 3XXX which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 TRAFALGAR 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
— 317-886 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 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
— 317-892 0XXX8XXX9XXX · 3 holders which blocks → HOME TEL. CO. OF PITTSBORO 0777 PITTSBORO IN
— 317-893 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF INDIANA, LP - IN 7060 GREENWOOD 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
— 317-896 0XXX which blocks → FRONTIER NORTH, INC.. - IN 0772 WESTFIELD 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
— 317-901 not yet reported which blocks → INDIANA PAGING NETWORK, INC. 6795 INDIANAPLS IN
— 317-902 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-903 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-904 not yet reported which blocks → INDIANA PAGING NETWORK, INC. 6795 INDIANAPLS IN
— 317-905 not yet reported which blocks → INDIANA PAGING NETWORK, INC. 6795 INDIANAPLS IN
— 317-906 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-910 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN

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.