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 740
FRONTIER NORTH, INC. - OH 123
OHIO BELL TEL CO 105
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 82
AERIAL COMMUNICATIONS, INC. 65
LEVEL 3 COMMUNICATIONS, LLC - OH 63
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
— 740-339 4XXX8XXX9XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 GALLIPOLIS OH
— 740-340 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BELLAIRE OH
— 740-342 8XXX which blocks → OHIO BELL TEL CO 9321 NEWLXINGTN OH
— 740-343 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → OHIO BELL TEL CO 9321 NEWLXINGTN OH
— 740-344 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 NEWARK OH
— 740-345 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 NEWARK OH
— 740-346 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 STEUBENVL OH
— 740-347 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → OHIO BELL TEL CO 9321 CORNING OH
— 740-348 5XXX6XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM OHIO, LLC 0665 NEWARK OH
— 740-349 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 NEWARK OH
— 740-350 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARIETTA OH
— 740-351 7XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-352 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PORTSMOUTH OH
— 740-353 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-354 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-355 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-356 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-357 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PORTSMOUTH OH
— 740-358 0XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 MT VERNON OH
— 740-359 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STCLAIRSVL OH
— 740-360 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 MARION OH
— 740-361 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 MARION OH
— 740-362 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 DELAWARE OH
— 740-363 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 DELAWARE OH
— 740-364 8XXX which blocks → WINDSTREAM OHIO, LLC 0665 NEWARK OH
— 740-366 not yet reported which blocks → WINDSTREAM OHIO, LLC 0665 NEWARK OH
— 740-367 1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 CHESHIRE OH
— 740-368 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 DELAWARE OH
— 740-369 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 DELAWARE OH
— 740-372 1XXX7XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 PORTSMOUTH OH
— 740-373 not yet reported which blocks → OHIO BELL TEL CO 9321 MARIETTA OH
— 740-374 not yet reported which blocks → OHIO BELL TEL CO 9321 MARIETTA OH
— 740-375 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-376 not yet reported which blocks → OHIO BELL TEL CO 9321 MARIETTA OH
— 740-377 1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 IRONTON OH
— 740-378 not yet reported which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 COOLVILLE OH
— 740-379 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 WALNUT OH
— 740-380 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 LOGAN OH
— 740-381 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 STEUBENVL OH
— 740-382 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-383 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-384 8XXX which blocks → FRONTIER NORTH, INC. - OH 0615 WELLSTON OH
— 740-385 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 LOGAN OH
— 740-386 none assigned yet which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-387 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-388 1XXX2XXX3XXX4XXX7XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 VINTON OH
— 740-389 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-390 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT VERNON OH
— 740-391 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 STCLAIRSVL OH
— 740-392 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MT VERNON 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.