NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

337 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 25
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 12
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
— 309-261 5XXX which blocks → T-MOBILE USA, INC. 6529 BLOOMINGTN IL
— 309-262 1XXX2XXX3XXX4XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BLOOMINGTN IL
— 309-263 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 MORTON IL
— 309-264 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 PEORIA IL
— 309-265 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 PEORIA IL
— 309-266 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 MORTON IL
— 309-267 none assigned yet which blocks → UNITED STATES CELLULAR - IL 6265 PEKIN IL
— 309-268 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-269 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
— 309-272 5XXX7XXX8XXX9XXX · 3 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J PEORIA IL
— 309-273 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-274 0XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CHILLICOTH IL
— 309-275 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BLOOMINGTN IL
— 309-276 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-277 not yet reported which blocks → PAETEC ITEL, LLC 829J MOLINE IL
— 309-278 2XXX3XXX7XXX8XXX which blocks → PAETEC ITEL, LLC 829J EASTMOLINE IL
— 309-279 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-280 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC 224C PEORIA IL
— 309-282 not yet reported which blocks → PAETEC ITEL, LLC 829J PEORIA IL
— 309-283 7XXX which blocks → PAETEC ITEL, LLC 829J ROCKISLAND IL
— 309-284 9XXX which blocks → FRONTIER NORTH, INC. - IL 1015 MORTON IL
— 309-285 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-286 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 TOULON IL
— 309-287 none assigned yet which blocks → METROPCS, INC. 5562 BLOOMINGTN IL
— 309-288 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MINERAL IL
— 309-289 1XXX which blocks → BRIGHTSPEED OF ILLINOIS, LLC 1057 KNOXVILLE IL
— 309-292 not yet reported which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
— 309-293 not yet reported which blocks → MID CENTURY TEL. COOP., INC. 1054 ELLISVILLE IL
— 309-294 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-295 0XXX2XXX5XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MACOMB IL
— 309-296 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-297 1XXX2XXX4XXX9XXX · 4 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J GALESBURG IL
— 309-298 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 MACOMB IL
— 309-299 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 GALESBURG IL
— 309-305 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J MINIERAGTN IL
— 309-310 0XXX which blocks → METROPCS, INC. 5562 BLOOMINGTN IL
— 309-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 309-312 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC 224C KEWANEE IL
— 309-313 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 MACOMB IL
— 309-314 9XXX which blocks → T-MOBILE USA, INC. 6529 MOLINE IL
— 309-320 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → TELNYX LLC 073H CAMERON IL
— 309-325 not yet reported which blocks → MCDONOUGH TEL. COOP. 1047 SMITHSHIRE IL
— 309-329 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ASTORIA IL
— 309-331 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → UNITED STATES CELLULAR - IL 6265 MACOMB IL
— 309-333 none assigned yet which blocks → UNITED STATES CELLULAR - IL 6265 MACOMB IL
— 309-334 not yet reported which blocks → WOODHULL COMMUNITY TEL. CO. 1091 WOODHULL IL
— 309-335 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 GALESBURG IL
— 309-337 none assigned yet which blocks → UNITED STATES CELLULAR - IL 6265 GALESBURG IL
— 309-338 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CANTON IL
— 309-339 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 PEORIA IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.