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
— 317-344 0XXX2XXX3XXX4XXX5XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF INDIANA, LP - IN 7060 ZIONSVILLE IN
— 317-345 2XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-346 not yet reported which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 FRANKLIN IN
— 317-347 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-348 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FISHERS IN
— 317-351 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-352 2XXX3XXX5XXX6XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-353 3XXX4XXX5XXX7XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-354 3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-355 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-356 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-357 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-358 0XXX3XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-359 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-361 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-367 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 INDIANAPLS IN
— 317-368 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 INDIANAPLS IN
— 317-370 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-371 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-372 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-373 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-374 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-375 5XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-376 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 CICERO IN
— 317-377 4XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-380 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-381 1XXX5XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-382 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-383 0XXX1XXX6XXX7XXX9XXX · 3 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-386 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 DANVILLE IN
— 317-387 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-388 5XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-390 4XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-392 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SHELBYVL IN
— 317-393 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-394 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-395 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF INDIANA, LP - IN 7060 SHELBYVL IN
— 317-396 not yet reported which blocks → PAETEC ITEL, LLC 829J INDIANAPLS IN
— 317-398 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SHELBYVL IN
— 317-402 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-403 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-404 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 INDIANAPLS IN
— 317-405 7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-407 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-408 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-409 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-410 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN
— 317-413 2XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-414 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS 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.