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
— 440-788 0XXX1XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 TRINITY OH
— 440-792 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 BRECKSVL OH
— 440-793 1XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 OLMSTEDFLS OH
— 440-794 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - OH 464C NOROYALTON OH
— 440-796 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PAINESVL OH
— 440-799 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
— 440-801 0XXX2XXX3XXX6XXX7XXX8XXX which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-804 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
— 440-808 not yet reported which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-809 3XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 VICTORY OH
— 440-810 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 WICKLIFFE OH
— 440-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 440-812 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ASHTABULA OH
— 440-815 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 GATESMILLS OH
— 440-816 not yet reported which blocks → OHIO BELL TEL CO 9321 BEREA OH
— 440-821 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-823 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-824 4XXX7XXX8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 BEREA OH
— 440-826 not yet reported which blocks → OHIO BELL TEL CO 9321 BEREA OH
— 440-827 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-829 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-833 1XXX4XXX7XXX8XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 WICKLIFFE OH
— 440-834 2XXX which blocks → OHIO BELL TEL CO 9321 BURTON OH
— 440-835 not yet reported which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-836 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 CHAGRINFLS OH
— 440-838 not yet reported which blocks → OHIO BELL TEL CO 9321 BRECKSVL OH
— 440-839 0XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WAKEMAN OH
— 440-840 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
— 440-842 not yet reported which blocks → OHIO BELL TEL CO 9321 VICTORY OH
— 440-843 not yet reported which blocks → OHIO BELL TEL CO 9321 VICTORY OH
— 440-845 not yet reported which blocks → OHIO BELL TEL CO 9321 VICTORY OH
— 440-846 not yet reported which blocks → OHIO BELL TEL CO 9321 STRONGSVL OH
— 440-847 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 TRINITY OH
— 440-848 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 NOROYALTON OH
— 440-853 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 PAINESVL OH
— 440-854 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WICKLIFFE OH
— 440-855 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ASHTABULA OH
— 440-856 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WILLOUGHBY OH
— 440-858 1XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 DORSET OH
— 440-860 3XXX4XXX6XXX7XXX8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 WICKLIFFE OH
— 440-862 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
— 440-863 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 BEREA OH
— 440-864 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELYRIA OH
— 440-866 1XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 VICTORY OH
— 440-867 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 PAINESVL OH
— 440-868 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 HILLCREST OH
— 440-869 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HILLCREST OH
— 440-871 not yet reported which blocks → OHIO BELL TEL CO 9321 TRINITY OH
— 440-873 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H WICKLIFFE OH
— 440-876 1XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 STRONGSVL 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.