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
— 317-415 3XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-416 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-417 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-418 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-420 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CICERO IN
— 317-421 6XXX7XXX9XXX · 3 holders which blocks → INDIANA BELL TEL CO INC 9325 SHELBYVL IN
— 317-422 not yet reported which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 BARGERSVL IN
— 317-423 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-424 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-425 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-427 0XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FAIRLAND IN
— 317-428 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-429 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
— 317-430 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-431 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-432 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-433 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-435 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-436 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FISHERS IN
— 317-439 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-440 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-441 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-442 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-443 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-444 0XXX1XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-445 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-446 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-448 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 GREENFIELD IN
— 317-450 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-453 0XXX1XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-454 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-455 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF INDIANA, LP - IN 7060 WESTNEWTON IN
— 317-456 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 BROWNSBURG IN
— 317-457 not yet reported which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-459 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-460 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
— 317-461 not yet reported which blocks → SPOK, INC. 6630 INDIANAPLS IN
— 317-462 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENFIELD IN
— 317-464 0XXX3XXX7XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-465 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-466 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-467 5XXX which blocks → INDIANA BELL TEL CO INC 9325 GREENFIELD IN
— 317-468 2XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → INDIANA BELL TEL CO INC 9325 GREENFIELD IN
— 317-469 1XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-470 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-471 7XXX9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-472 6XXX7XXX which blocks → PAETEC ITEL, LLC 829J INDIANAPLS IN
— 317-475 8XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-477 not yet reported which blocks → HANCOCK COMMUNICATIONS, INC. - IN 7459 GREENFIELD IN
— 317-479 6XXX 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.