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
2001-06-26 740-575 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → OHIO BELL TEL CO 9321 COSHOCTON OH
2001-06-26 740-577 0–9 XXXall 10 · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 JACKSON OH
2001-06-26 740-620 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → OHIO BELL TEL CO 9321 WSNGTNCTHS OH
2001-06-26 740-628 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WOODSFIELD OH
2001-06-26 740-629 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARIETTA OH
2001-06-26 740-651 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MCONNELSVL OH
2001-06-26 740-809 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 JOHNSTOWN OH
2001-06-06 740-879 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CHESHIRCTR OH
2001-06-05 740-263 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 MT VERNON OH
2001-06-05 740-953 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHESHIRCTR OH
2001-05-29 740-835 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WAVERLY OH
2001-05-23 740-403 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 NEWARK OH
2001-05-18 740-590 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ATHENS OH
2001-05-11 740-280 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 PHILO OH
2001-05-11 740-291 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 COSHOCTON OH
2001-05-08 740-818 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ATHENS OH
2001-05-08 740-834 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DELAWARE OH
2001-05-03 740-630 1XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CAMBRIDGE OH
2001-05-03 740-631 1XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 SUMMERFLD OH
2001-04-17 740-251 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MARION OH
2001-04-16 740-202 4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COSHOCTON OH
2001-04-08 740-831 0–9 XXXall 10 · 7 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K MTSTERLING OH
2001-03-20 740-463 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 WSNGTNCTHS OH
2001-02-06 740-207 2XXX3XXX4XXX9XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 CIRCLEVL OH
2001-02-06 740-304 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 LANCASTER OH
2001-01-10 740-507 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 MT VERNON OH
2001-01-05 740-864 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → OHIO BELL TEL CO 9321 NEWMTMORAS OH
— 740-201 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 CHESHIRCTR OH
— 740-203 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 DELAWARE OH
— 740-204 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CARROLL OH
— 740-205 2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LANCASTER OH
— 740-206 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LONDON OH
— 740-208 2XXX4XXX5XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 GALLIPOLIS OH
— 740-209 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 GALLIPOLIS OH
— 740-210 not yet reported which blocks → SPOK, INC. 6630 NEWARK OH
— 740-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 740-215 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANCASTER OH
— 740-219 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 STEUBENVL OH
— 740-221 5XXX7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ZANESVILLE OH
— 740-223 5XXX6XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MARION OH
— 740-225 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 MARION OH
— 740-226 0XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - OH 0615 BEAVER OH
— 740-227 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWCOMRSTN OH
— 740-228 0XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WOODSFIELD OH
— 740-229 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UHRICHSVL OH
— 740-230 not yet reported which blocks → RAM TECHNOLOGIES, INC. - OH 6596 PORTSMOUTH OH
— 740-232 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 STCLAIRSVL OH
— 740-242 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → OHIO BELL TEL CO 9321 THORNVILLE OH
— 740-243 3XXX4XXX6XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANCASTER OH
— 740-244 0XXX7XXX8XXX · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 MARION 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.