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
— 440-585 not yet reported which blocks → OHIO BELL TEL CO 9321 WICKLIFFE OH
— 440-593 not yet reported which blocks → CONNEAUT TEL. CO. 0606 CONNEAUT OH
— 440-594 not yet reported which blocks → CONNEAUT TEL. CO. 0606 CONNEAUT OH
— 440-599 not yet reported which blocks → CONNEAUT TEL. CO. 0606 CONNEAUT OH
— 440-602 0XXX1XXX2XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 WILLOUGHBY OH
— 440-603 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-604 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-605 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-606 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 KIRTLAND OH
— 440-607 1XXX2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 LEROY OH
— 440-610 7XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELYRIA OH
— 440-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 440-612 not yet reported which blocks → SPOK, INC. 6630 WILLOUGHBY OH
— 440-614 1XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J TRINITY OH
— 440-616 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C LORAIN OH
— 440-617 3XXX5XXX6XXX8XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-626 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
— 440-627 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NUSO, LLC 732J BRECKSVL OH
— 440-628 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NOROYALTON OH
— 440-632 4XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 MIDDLEFLD OH
— 440-635 3XXX6XXX7XXX · 3 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 E CLARIDON OH
— 440-636 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 HUNTSBURG OH
— 440-637 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 PAINESVL OH
— 440-638 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 STRONGSVL OH
— 440-639 not yet reported which blocks → OHIO BELL TEL CO 9321 PAINESVL OH
— 440-646 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-647 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 WELLINGTON OH
— 440-649 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
— 440-652 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 NOROYALTON OH
— 440-653 2XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 AVON LAKE OH
— 440-655 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
— 440-658 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BEDFORD OH
— 440-660 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J BRECKSVL OH
— 440-663 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → FIRST COMMUNICATIONS, LLC 460K VICTORY OH
— 440-665 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-666 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-667 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-668 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-669 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-670 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LORAIN OH
— 440-673 2XXX3XXX5XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
— 440-675 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WILLOUGHBY OH
— 440-678 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CHESTERLD OH
— 440-679 3XXX6XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-680 not yet reported which blocks → SPOK, INC. 6630 WILLOUGHBY OH
— 440-682 0XXX1XXX2XXX3XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BURTON OH
— 440-683 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST OH
— 440-684 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-685 not yet reported which blocks → HANSON COMMUNICATIONS OF OHIO, LLC-ORWELL 0649 NOBLOOMFLD OH
— 440-686 9XXX which blocks → OHIO BELL TEL CO 9321 TRINITY 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.