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
— 440-693 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 MESOPOTMIA OH
— 440-699 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST OH
— 440-700 not yet reported which blocks → OH
— 440-701 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 MENTOR OH
— 440-703 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 BEDFORD OH
— 440-708 3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 BAINBRIDGE OH
— 440-709 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 PAINESVL OH
— 440-710 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WILLOUGHBY OH
— 440-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 440-715 0XXX3XXX5XXX6XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CHAGRINFLS OH
— 440-716 not yet reported which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-717 not yet reported which blocks → OHIO BELL TEL CO 9321 BRECKSVL OH
— 440-720 4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-721 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 PAINESVL OH
— 440-724 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-725 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
— 440-728 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-729 not yet reported which blocks → OHIO BELL TEL CO 9321 CHESTERLD OH
— 440-730 0XXX1XXX3XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
— 440-733 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 PAINESVL OH
— 440-734 not yet reported which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-735 8XXX which blocks → OHIO BELL TEL CO 9321 BEDFORD OH
— 440-736 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 BRECKSVL OH
— 440-740 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 BRECKSVL OH
— 440-742 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 WILLOUGHBY OH
— 440-743 6XXX9XXX which blocks → OHIO BELL TEL CO 9321 VICTORY OH
— 440-744 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 KIRTLAND OH
— 440-745 3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 GATESMILLS OH
— 440-746 6XXX which blocks → OHIO BELL TEL CO 9321 BRECKSVL OH
— 440-747 0–9 XXXall 10 · 2 holders which blocks → AT&T ENTERPRISES, LLC 516C VICTORY OH
— 440-748 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 NORTHEATON OH
— 440-751 0XXX3XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 OBERLIN OH
— 440-753 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST OH
— 440-756 2XXX3XXX4XXX6XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 OLMSTEDFLS OH
— 440-758 not yet reported which blocks → SPOK, INC. 6630 ELYRIA OH
— 440-759 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-760 0XXX1XXX2XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLC - OH 464C LEROY OH
— 440-762 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - OH 464C LEROY OH
— 440-764 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 BURTON OH
— 440-773 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-774 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 OBERLIN OH
— 440-775 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 OBERLIN OH
— 440-776 0XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 OBERLIN OH
— 440-777 not yet reported which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-779 not yet reported which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-782 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 OLMSTEDFLS OH
— 440-783 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 STRONGSVL OH
— 440-784 not yet reported which blocks → SPOK, INC. 6630 WICKLIFFE OH
— 440-785 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-786 5XXX6XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 BEDFORD 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.