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
— 317-557 none assigned yet which blocks → METROPCS, INC. 5562 INDIANAPLS IN
— 317-558 9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 FISHERS IN
— 317-562 0XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-564 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 CARMEL IN
— 317-566 4XXX which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-567 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 FISHERS IN
— 317-568 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-569 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-570 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-571 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-572 0XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 FISHERS IN
— 317-573 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-574 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-575 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-576 2XXX3XXX4XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-577 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-578 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-579 5XXX which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-580 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-581 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-582 6XXX which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-584 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 MOORESVL IN
— 317-585 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-587 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-588 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-590 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-591 9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-592 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-594 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-595 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-596 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-598 5XXX7XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-599 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IN 097D INDIANAPLS IN
— 317-603 not yet reported which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-605 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-607 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-610 0XXX1XXX6XXX7XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN
— 317-612 1XXX4XXX7XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-613 7XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-614 0XXX5XXX7XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-615 0XXX3XXX8XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-616 8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
— 317-621 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-623 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 NEWPALSTIN IN
— 317-624 2XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-625 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-626 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-627 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-630 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.