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
— 440-332 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 BURTON OH
— 440-333 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 440-336 8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WILLOUGHBY OH
— 440-338 not yet reported which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 RUSSELL OH
— 440-339 2XXX which blocks → T-MOBILE USA, INC. 6529 PAINESVL OH
— 440-343 8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WILLOUGHBY OH
— 440-345 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 VICTORY OH
— 440-346 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-347 not yet reported which blocks → OHIO BELL TEL CO 9321 WICKLIFFE OH
— 440-348 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → XO OHIO, INC. 7520 TRINITY OH
— 440-349 not yet reported which blocks → OHIO BELL TEL CO 9321 CHAGRINFLS OH
— 440-350 not yet reported which blocks → OHIO BELL TEL CO 9321 PAINESVL OH
— 440-352 not yet reported which blocks → OHIO BELL TEL CO 9321 PAINESVL OH
— 440-353 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-354 not yet reported which blocks → OHIO BELL TEL CO 9321 PAINESVL OH
— 440-355 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-356 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 440-357 not yet reported which blocks → OHIO BELL TEL CO 9321 PAINESVL OH
— 440-358 not yet reported which blocks → OHIO BELL TEL CO 9321 PAINESVL OH
— 440-359 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 BEDFORD OH
— 440-363 0XXX1XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LEROY OH
— 440-365 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-366 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 ELYRIA OH
— 440-367 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 KIRTLAND OH
— 440-368 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MENTOR OH
— 440-372 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NOROYALTON OH
— 440-373 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 WICKLIFFE OH
— 440-374 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J BEDFORD OH
— 440-375 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 PAINESVL OH
— 440-376 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
— 440-377 1XXX2XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 OLMSTEDFLS OH
— 440-378 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 STRONGSVL OH
— 440-379 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC - OH 464C KIRTLAND OH
— 440-380 not yet reported which blocks → SPOK, INC. 6630 VICTORY OH
— 440-385 1XXX3XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 TRINITY OH
— 440-386 1XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HILLCREST OH
— 440-388 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 KIRTLAND OH
— 440-389 0XXX1XXX3XXX4XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 GATESMILLS OH
— 440-391 5XXX6XXX7XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
— 440-392 4XXX which blocks → OHIO BELL TEL CO 9321 PAINESVL OH
— 440-394 1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CHAGRINFLS OH
— 440-395 not yet reported which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-397 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BRECKSVL OH
— 440-398 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BEREA OH
— 440-399 0XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BEDFORD OH
— 440-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 440-413 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 PAINESVL OH
— 440-414 3XXX4XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 TRINITY OH
— 440-415 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 GENEVA OH
— 440-417 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 MADISON 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.