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
2012-09-17 440-504 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
2012-08-28 440-408 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HILLCREST OH
2012-08-28 440-430 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 TRINITY OH
2012-08-28 440-501 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VICTORY OH
2012-08-10 440-407 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2012-07-13 440-405 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BRECKSVL OH
2012-04-13 440-402 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 TRINITY OH
2012-03-15 440-217 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HILLCREST OH
2012-02-07 440-401 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 TRINITY OH
2012-02-02 440-208 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BRECKSVL OH
2012-02-02 440-314 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
2011-09-16 440-214 0–9 XXXall 10 · 7 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 CHARDON OH
2011-09-16 440-261 0–9 XXXall 10 · 8 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 ASHTABULA OH
2011-09-16 440-307 0–9 XXXall 10 · 6 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 MADISON OH
2011-08-31 440-305 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F BEREA OH
2011-07-28 440-222 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
2011-03-13 440-961 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K AVON LAKE OH
2011-01-11 440-600 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J CHAGRINFLS OH
2010-12-21 440-400 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2010-12-21 440-800 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VICTORY OH
2010-10-19 440-481 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VICTORY OH
2010-02-02 440-420 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ELYRIA OH
2009-12-04 440-252 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C BEDFORD OH
2009-10-07 440-381 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2009-09-22 440-723 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
2009-09-08 440-731 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ELYRIA OH
2008-10-17 440-791 0XXX1XXX2XXX4XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 GRAFTON OH
2008-10-08 440-633 0–9 XXXwhole prefix which blocks → OHIO BELL TEL CO 9321 CHAGRINFLS OH
2008-09-16 440-384 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BAINBRIDGE OH
2008-08-21 440-752 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 LORAIN OH
2008-06-27 440-828 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → ARMSTRONG TELECOMMUNICATIONS, INC. - OH 024E WELLINGTON OH
2008-06-11 440-822 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ELYRIA OH
2008-05-28 440-941 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F CLEVELAND OH
2008-03-28 440-789 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ASHTABULA OH
2008-03-25 440-689 0–9 XXXall 10 · 6 holders which blocks → ARMSTRONG TELECOMMUNICATIONS, INC. - OH 024E ANDOVER OH
2007-11-28 440-695 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 AVON OH
2007-11-07 440-654 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
2007-07-06 440-596 0–9 XXXall 10 · 4 holders which blocks → CITYNET OHIO, LLC - OH 036B CLEVELAND OH
2007-06-20 440-624 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K JEFFERSON OH
2007-04-28 440-688 0–9 XXXall 10 · 9 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K CHESTERLD OH
2007-03-15 440-787 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
2006-12-01 440-591 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BAINBRIDGE OH
2006-05-30 440-987 1XXX3XXX4XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WELLINGTON OH
2006-04-26 440-707 0XXX1XXX2XXX4XXX6XXX7XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 OBERLIN OH
2006-04-17 440-714 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 LORAIN OH
2006-01-18 440-447 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BRECKSVL OH
2005-11-17 440-334 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STRONGSVL OH
2004-11-02 440-218 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRUMBULL OH
2004-07-09 440-226 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHARDON OH
2003-08-05 440-431 0–9 XXXall 10 · 4 holders which blocks → OHIO BELL TEL CO 9321 HILLCREST 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.