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
2014-03-06 440-641 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F TRINITY OH
2014-03-04 440-561 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHAGRINFLS OH
2014-02-04 440-732 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 STRONGSVL OH
2014-02-03 440-351 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
2013-10-07 440-469 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
2013-10-04 440-219 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ELYRIA OH
2013-09-18 440-719 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHAGRINFLS OH
2013-06-25 440-370 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K AMHERST OH
2013-06-25 440-403 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BEREA OH
2013-06-25 440-421 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K HILLCREST OH
2013-06-18 440-560 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → GREAT WAVE BROADBAND SERVICES, LLC 032H ROCK CREEK OH
2013-06-18 440-990 0–9 XXXall 10 · 3 holders which blocks → GREAT WAVE BROADBAND SERVICES, LLC 032H ASHTABULA OH
2013-06-14 440-830 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
2013-06-06 440-805 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 ROCK CREEK OH
2013-04-26 440-426 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MIDDLEFLD OH
2013-04-10 440-444 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LORAIN OH
2013-04-04 440-340 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F VICTORY OH
2013-04-04 440-455 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F TRINITY OH
2013-04-04 440-630 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F BRECKSVL OH
2013-02-12 440-910 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST OH
2013-02-11 440-620 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST OH
2013-01-28 440-475 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2013-01-28 440-559 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2013-01-28 440-615 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2013-01-28 440-618 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BRECKSVL OH
2013-01-28 440-619 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BRECKSVL OH
2013-01-28 440-651 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2013-01-28 440-712 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BRECKSVL OH
2013-01-28 440-770 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BRECKSVL OH
2013-01-28 440-802 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BRECKSVL OH
2013-01-28 440-806 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2013-01-23 440-608 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HILLCREST OH
2013-01-23 440-609 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VICTORY OH
2013-01-23 440-704 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
2013-01-23 440-706 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HILLCREST OH
2013-01-23 440-718 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HILLCREST OH
2013-01-23 440-727 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VICTORY OH
2013-01-23 440-763 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
2013-01-23 440-803 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VICTORY OH
2013-01-23 440-818 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
2013-01-11 440-713 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BRECKSVL OH
2012-12-13 440-432 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
2012-12-13 440-438 0–9 XXXall 10 · 2 holders which blocks → SIGECOM, LLC DBA WOW INTERNET CABLE AND PHONE 735E TRINITY OH
2012-12-13 440-509 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BEREA OH
2012-12-13 440-515 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HILLCREST OH
2012-12-13 440-631 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VICTORY OH
2012-12-13 440-702 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HILLCREST OH
2012-11-27 440-480 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2012-10-15 440-410 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 BRECKSVL OH
2012-09-30 440-406 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 ELYRIA 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.