NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 567
8X8, INC. 1
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
2004-09-29 567-623 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC - OH 464C HURON OH
2004-09-29 567-952 0XXX2XXX7XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K WATERVILLE OH
2004-09-28 567-275 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 SHELBY OH
2004-09-16 567-855 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 8 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7158 CLYDE OH
2004-04-27 567-371 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TIER 2 COMMUNICATIONS, LLC 8168 LIMA OH
2004-04-22 567-240 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT GILEAD OH
2004-03-22 567-429 1XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - OH 464C FINDLAY OH
2004-02-06 567-230 1XXX5XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TIFFIN OH
2004-01-08 567-205 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J BLOOMINGVL OH
2004-01-08 567-206 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J LINDSEY OH
2004-01-08 567-243 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J CASTALIA OH
2004-01-08 567-246 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J WHITEHOUSE OH
2004-01-08 567-281 0–9 XXXall 10 · 8 holders which blocks → PAETEC ITEL, LLC 829J NEW RIEGEL OH
2003-12-18 567-227 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLARD OH
2003-08-28 567-267 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BELLEVUE OH
2003-02-25 567-274 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANSFIELD OH
2003-02-25 567-283 0–9 XXXall 10 · 9 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SANDUSKY OH
2003-02-07 567-272 2XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 EVANSPORT OH
2003-01-27 567-276 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TIER 2 COMMUNICATIONS, LLC 8168 BRYAN OH
2003-01-27 567-279 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TIER 2 COMMUNICATIONS, LLC 8168 CELINA OH
2002-12-30 567-278 7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BASCOM OH
2002-11-30 567-229 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K DUNKIRK OH
2002-11-14 567-277 3XXX4XXX5XXX6XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 TOLEDO OH
2002-11-13 567-259 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TIER 2 COMMUNICATIONS, LLC 8168 VAN WERT OH
2002-11-13 567-264 3XXX4XXX7XXX · 3 holders which blocks → TIER 2 COMMUNICATIONS, LLC 8168 NAPOLEON OH
2002-10-22 567-674 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 KENTON OH
2002-10-01 567-245 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 FOSTORIA OH
2002-09-27 567-204 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 LIMA OH
2002-09-05 567-249 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 TOLEDO OH
2002-08-27 567-241 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MANSFIELD OH
2002-08-27 567-242 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LIMA OH
2002-08-19 567-238 6XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LOUDONVL OH
2002-08-19 567-380 3XXX7XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 SCOTT OH
2002-08-19 567-386 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WAYNEBRDNR OH
2002-08-19 567-391 0XXX1XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NEW LONDON OH
2002-08-19 567-393 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 GALION OH
2002-08-19 567-401 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 9 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MILAN OH
2002-08-19 567-412 0XXX1XXX2XXX3XXX5XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WEST SALEM OH
2002-08-19 567-424 0XXX1XXX3XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NORWALK OH
2002-08-19 567-432 0XXX1XXX3XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NO BALTIMR OH
2002-08-19 567-443 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CRESTLINE OH
2002-08-19 567-472 0XXX2XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 PEMBERVL OH
2002-08-19 567-495 0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WESTON OH
2002-08-16 567-228 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BELLEVUE OH
2002-08-16 567-234 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BERLIN HTS OH
2002-08-16 567-235 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 EVANSPORT OH
2002-08-16 567-237 0XXX1XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BETTSVILLE OH
2002-08-16 567-239 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BRYAN OH
2002-08-16 567-349 1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HELENA OH
2002-08-16 567-357 0XXX1XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CONGRESS 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.