NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 440
OHIO BELL TEL CO 124
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 115
LEVEL 3 COMMUNICATIONS, LLC - OH 68
T-MOBILE USA, INC. 62
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 52
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
— 440-422 not yet reported which blocks → HANSON COMMUNICATIONS OF OHIO, LLC-ORWELL 0649 COLEBROOK OH
— 440-423 5XXX8XXX9XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 GATESMILLS OH
— 440-424 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CHAGRINFLS OH
— 440-425 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - OH 464C BURTON OH
— 440-427 3XXX4XXX5XXX7XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 OLMSTEDFLS OH
— 440-428 not yet reported which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 MADISON OH
— 440-429 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-434 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LORAIN OH
— 440-435 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 GATESMILLS OH
— 440-437 not yet reported which blocks → HANSON COMMUNICATIONS OF OHIO, LLC-ORWELL 0649 ORWELL OH
— 440-439 not yet reported which blocks → OHIO BELL TEL CO 9321 BEDFORD OH
— 440-442 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-443 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → FIRST COMMUNICATIONS, LLC 460K HILLCREST OH
— 440-445 none assigned yet which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 MENTOR OH
— 440-446 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-448 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - OH 464C GATESMILLS OH
— 440-449 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-452 0XXX which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
— 440-453 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
— 440-456 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-457 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 NOROYALTON OH
— 440-458 0XXX1XXX2XXX · 2 holders which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-460 8XXX9XXX which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-461 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-463 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
— 440-465 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-466 not yet reported which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 GENEVA OH
— 440-471 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 TRINITY OH
— 440-473 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-474 2XXX3XXX which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 TRUMBULL OH
— 440-476 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-477 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-478 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-479 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-483 9XXX which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-484 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HILLCREST OH
— 440-487 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-488 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-489 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 TRINITY OH
— 440-490 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 CHESTERLD OH
— 440-491 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - OH 464C GENEVA OH
— 440-492 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 BURTON OH
— 440-494 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 WICKLIFFE OH
— 440-497 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 WILLOUGHBY OH
— 440-498 not yet reported which blocks → OHIO BELL TEL CO 9321 CHAGRINFLS OH
— 440-499 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 VICTORY OH
— 440-503 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BEREA OH
— 440-505 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CHAGRINFLS OH
— 440-507 not yet reported which blocks → SPOK, INC. 6630 WILLOUGHBY OH
— 440-508 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 OLMSTEDFLS OH

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.