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
2001-10-08 317-563 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 DANVILLE IN
2001-08-21 317-401 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 SHELBYVL IN
2001-06-15 317-537 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 TELECOM OF INDIANA, LP - IN 7060 FISHERS IN
2001-06-15 317-561 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 PLAINFIELD IN
2001-06-04 317-492 0XXX1XXX3XXX7XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
2001-05-22 317-399 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF INDIANA, LP - IN 7060 WESTFIELD IN
2001-05-09 317-503 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
2001-05-09 317-504 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
2001-05-09 317-518 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
2001-04-20 317-716 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
2001-04-18 317-294 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
2001-04-18 317-313 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
2001-04-18 317-319 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
2001-04-18 317-604 2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SHELBYVL IN
2001-04-18 317-709 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
2001-04-18 317-847 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
2001-04-18 317-908 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
2001-04-10 317-962 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
2001-04-10 317-963 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
2001-04-10 317-964 0XXX1XXX3XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
2001-04-10 317-968 0XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
2001-04-03 317-268 2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J PLAINFIELD IN
2001-02-15 317-538 none assigned yet which blocks → METROPCS, INC. 5562 INDIANAPLS IN
2001-02-05 317-809 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
2001-01-22 317-985 8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-200 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-201 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-202 1XXX5XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-203 5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J PLAINFIELD IN
— 317-204 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 PLAINFIELD IN
— 317-205 1XXX4XXX5XXX6XXX7XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-207 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 CHARLOTSVL IN
— 317-208 0XXX which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-209 4XXX5XXX6XXX7XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN
— 317-213 2XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-214 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J NOBLESVL IN
— 317-215 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J GREENWOOD IN
— 317-216 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-217 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-218 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J CARMEL IN
— 317-219 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NOBLESVL IN
— 317-221 9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-222 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-223 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 TELECOM OF INDIANA, LP - IN 7060 INDIANAPLS IN
— 317-225 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
— 317-226 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-227 9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-228 7XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-229 5XXX6XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 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.