NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
2001-03-29 440-342 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
2001-02-21 440-382 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
2001-02-21 440-781 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
2001-02-06 440-622 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PAINESVL OH
2001-02-06 440-623 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
2001-01-17 440-229 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 HILLCREST OH
2001-01-10 440-813 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ASHTABULA OH
— 440-201 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 BEDFORD OH
— 440-202 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 BEREA OH
— 440-203 not yet reported which blocks → SPOK, INC. 6630 LORAIN OH
— 440-204 5XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF OHIO, LLC 0630 LORAIN OH
— 440-205 not yet reported which blocks → OHIO BELL TEL CO 9321 MENTOR OH
— 440-206 6XXX7XXX8XXX which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 AUSTINBURG OH
— 440-207 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
— 440-209 2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 MENTOR OH
— 440-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 440-213 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ELYRIA OH
— 440-215 2XXX7XXX · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WAKEMAN OH
— 440-221 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-223 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-224 4XXX8XXX · 2 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 KINGSVILLE OH
— 440-225 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ELYRIA OH
— 440-227 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
— 440-228 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
— 440-230 3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 NOROYALTON OH
— 440-232 not yet reported which blocks → OHIO BELL TEL CO 9321 BEDFORD OH
— 440-233 9XXX which blocks → BRIGHTSPEED OF OHIO, LLC 0630 LORAIN OH
— 440-234 not yet reported which blocks → OHIO BELL TEL CO 9321 BEREA OH
— 440-235 not yet reported which blocks → OHIO BELL TEL CO 9321 OLMSTEDFLS OH
— 440-236 0XXX2XXX4XXX · 2 holders which blocks → WINDSTREAM OHIO, LLC 0665 COLUMBISTA OH
— 440-237 not yet reported which blocks → OHIO BELL TEL CO 9321 NOROYALTON OH
— 440-238 not yet reported which blocks → OHIO BELL TEL CO 9321 STRONGSVL OH
— 440-239 not yet reported which blocks → OHIO BELL TEL CO 9321 BEREA OH
— 440-240 3XXX4XXX8XXX · 3 holders which blocks → BRIGHTSPEED OF OHIO, LLC 0630 LORAIN OH
— 440-242 0XXX1XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF OHIO, LLC 0630 LORAIN OH
— 440-243 not yet reported which blocks → OHIO BELL TEL CO 9321 BEREA OH
— 440-244 not yet reported which blocks → BRIGHTSPEED OF OHIO, LLC 0630 LORAIN OH
— 440-245 not yet reported which blocks → BRIGHTSPEED OF OHIO, LLC 0630 LORAIN OH
— 440-246 not yet reported which blocks → BRIGHTSPEED OF OHIO, LLC 0630 LORAIN OH
— 440-247 not yet reported which blocks → OHIO BELL TEL CO 9321 CHAGRINFLS OH
— 440-248 not yet reported which blocks → OHIO BELL TEL CO 9321 CHAGRINFLS OH
— 440-249 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 TRINITY OH
— 440-250 6XXX which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-253 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 VICTORY OH
— 440-254 0XXX1XXX2XXX7XXX9XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 LEROY OH
— 440-255 not yet reported which blocks → OHIO BELL TEL CO 9321 MENTOR OH
— 440-256 6XXX7XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 KIRTLAND OH
— 440-257 not yet reported which blocks → OHIO BELL TEL CO 9321 MENTOR OH
— 440-258 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
— 440-259 6XXX7XXX8XXX · 2 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 PERRY OH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.