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
2002-12-31 440-541 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LORAIN OH
2002-10-14 440-241 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
2002-10-12 440-521 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
2002-09-27 440-371 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ELYRIA OH
2002-09-22 440-310 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 COLUMBISTA OH
2002-09-16 440-316 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NORTHEATON OH
2002-08-21 440-364 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
2002-07-11 440-278 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 WICKLIFFE OH
2002-07-11 440-318 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHAGRINFLS OH
2002-07-11 440-390 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 NOROYALTON OH
2002-07-11 440-454 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 OLMSTEDFLS OH
2002-07-11 440-532 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
2002-07-11 440-533 1XXX3XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 GATESMILLS OH
2002-06-28 440-321 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 E CLARIDON OH
2002-06-28 440-361 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GENEVA OH
2002-06-06 440-335 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K KINGSVILLE OH
2002-05-01 440-251 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 PAINESVL OH
2002-04-22 440-212 5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 STRONGSVL OH
2002-04-22 440-360 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 TRINITY OH
2002-04-22 440-681 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 HILLCREST OH
2002-04-22 440-749 3XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 WILLOUGHBY OH
2002-04-22 440-832 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BRECKSVL OH
2002-04-21 440-625 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BEREA OH
2002-04-19 440-590 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 VICTORY OH
2002-04-16 440-409 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
2002-04-08 440-320 3XXX4XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 LORAIN OH
2002-04-08 440-739 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 NEWBURY OH
2002-04-08 440-983 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MADISON OH
2002-03-20 440-231 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PAINESVL OH
2002-03-20 440-313 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 E CLARIDON OH
2002-03-20 440-317 2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BEDFORD OH
2002-03-20 440-319 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ASHTABULA OH
2002-03-20 440-506 3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELYRIA OH
2002-02-25 440-557 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K RUSSELL OH
2002-01-10 440-315 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 ELYRIA OH
2001-11-15 440-296 0–9 XXXall 10 · 4 holders which blocks → OHIO BELL TEL CO 9321 PAINESVL OH
2001-09-21 440-554 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
2001-09-17 440-551 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 PAINESVL OH
2001-08-24 440-308 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 LORAIN OH
2001-08-02 440-341 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 WILLOUGHBY OH
2001-07-09 440-396 6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 LORAIN OH
2001-07-09 440-645 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ASHTABULA OH
2001-06-27 440-387 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 ELYRIA OH
2001-06-25 440-337 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CHAGRINFLS OH
2001-06-23 440-865 4XXX5XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELYRIA OH
2001-05-23 440-344 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ASHTABULA OH
2001-05-22 440-271 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 PARKMAN OH
2001-05-16 440-220 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLOUGHBY OH
2001-05-11 440-210 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 PAINESVL OH
2001-04-03 440-312 not yet reported 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.