NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, 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
— 317-281 none assigned yet which blocks → METROPCS, INC. 5562 INDIANAPLS IN
— 317-282 0XXX3XXX7XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-283 9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-284 1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J FISHERS IN
— 317-285 0XXX8XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-286 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 BROWNSBURG IN
— 317-287 4XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-288 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J FISHERS IN
— 317-289 2XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-290 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-291 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-292 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-293 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-295 2XXX6XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-297 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-298 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-299 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-301 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 INDIANAPLS IN
— 317-302 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 INDIANAPLS IN
— 317-304 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 INDIANAPLS IN
— 317-305 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 INDIANAPLS IN
— 317-306 0XXX1XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-307 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-308 0XXX1XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-309 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-310 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 INDIANAPLS IN
— 317-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN
— 317-312 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 INDIANAPLS IN
— 317-318 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 GREENFIELD IN
— 317-320 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-321 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-322 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-323 not yet reported which blocks → HANCOCK RURAL TELEPHONE CORP. DBA NINESTAR CONNECT 0775 MAXWELL IN
— 317-324 5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 CARMEL IN
— 317-325 8XXX which blocks → HANCOCK COMMUNICATIONS, INC. - IN 7459 GREENFIELD IN
— 317-326 not yet reported which blocks → HANCOCK RURAL TELEPHONE CORP. DBA NINESTAR CONNECT 0775 MAXWELL IN
— 317-327 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-328 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-329 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-331 2XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-332 not yet reported which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-334 5XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-335 not yet reported which blocks → HANCOCK RURAL TELEPHONE CORP. DBA NINESTAR CONNECT 0775 MCCORDSVL IN
— 317-336 not yet reported which blocks → HANCOCK RURAL TELEPHONE CORP. DBA NINESTAR CONNECT 0775 MCCORDSVL IN
— 317-337 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-338 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-339 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-340 2XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-341 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-343 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - IN 105F CARMEL IN

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.