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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 440-260 not yet reported which blocks → OHIO BELL TEL CO 9321 BEREA OH
— 440-262 0XXX3XXX5XXX6XXX7XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 BRECKSVL OH
— 440-263 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BEREA OH
— 440-264 0XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 CHAGRINFLS OH
— 440-265 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CONNEAUT OH
— 440-266 3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 MENTOR OH
— 440-268 1XXX6XXX8XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 STRONGSVL OH
— 440-269 0XXX5XXX9XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 WILLOUGHBY OH
— 440-270 not yet reported which blocks → SPOK, INC. 6630 WILLOUGHBY OH
— 440-272 not yet reported which blocks → HANSON COMMUNICATIONS OF OHIO, LLC-ORWELL 0649 WINDSOR OH
— 440-273 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BURTON OH
— 440-274 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J BEREA OH
— 440-275 5XXX which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 AUSTINBURG OH
— 440-277 not yet reported which blocks → BRIGHTSPEED OF OHIO, LLC 0630 LORAIN OH
— 440-279 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 CHARDON OH
— 440-280 0XXX1XXX2XXX · 2 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 PERRY OH
— 440-281 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELYRIA OH
— 440-282 not yet reported which blocks → BRIGHTSPEED OF OHIO, LLC 0630 LORAIN OH
— 440-283 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WILLOUGHBY OH
— 440-284 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-285 not yet reported which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 CHARDON OH
— 440-286 not yet reported which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 CHARDON OH
— 440-287 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J CHAGRINFLS OH
— 440-288 not yet reported which blocks → BRIGHTSPEED OF OHIO, LLC 0630 LORAIN OH
— 440-289 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
— 440-290 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MENTOR OH
— 440-291 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 AUSTINBURG OH
— 440-292 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J VICTORY OH
— 440-293 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 ANDOVER OH
— 440-294 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 NEW LYME OH
— 440-295 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J WICKLIFFE OH
— 440-297 0XXX1XXX2XXX3XXX4XXX9XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 BEREA OH
— 440-298 2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 THOMPSON OH
— 440-299 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MENTOR OH
— 440-301 not yet reported which blocks → SPOK, INC. 6630 WILLOUGHBY OH
— 440-302 not yet reported which blocks → SPOK, INC. 6630 WILLOUGHBY OH
— 440-303 not yet reported which blocks → SPOK, INC. 6630 WILLOUGHBY OH
— 440-304 not yet reported which blocks → SPOK, INC. 6630 WILLOUGHBY OH
— 440-306 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 WILLOUGHBY OH
— 440-309 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 440-322 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-323 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-324 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-325 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BEREA OH
— 440-326 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-327 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-328 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-329 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-331 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND 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.