NumberResearch Membership · Data 09/18/2026

Recent prefix assignments

369 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/18/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.

Most active assignees, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 37
NEW CINGULAR WIRELESS PCS, LLC - IL 33
NEW CINGULAR WIRELESS PCS, LLC - DC 30
ONVOY, LLC - TX 18
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-NXXAssigneeOCNRate centerState
309-417 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
309-418 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
309-419 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
309-420 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
309-422 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
309-423 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
309-424 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 PEORIA IL
309-426 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ROSEVILLE IL
309-427 ILLINOIS BELL TEL CO 9329 PEORIA IL
309-431 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
309-432 FRONTIER NORTH, INC. - IL 1015 MINONK IL
309-433 SKYE TELECOM LLC DBA SKYETEL 622J BLOOMINGTN IL
309-434 FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
309-436 FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
309-437 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
309-438 FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
309-439 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
309-441 GENESEO TEL. CO. 1016 GREENRIVER IL
309-443 FRONTIER NORTH, INC. - IL 1015 LOW POINT IL
309-444 FRONTIER NORTH, INC. - IL 1015 WASHINGTON IL
309-446 FRONTIER NORTH, INC. - IL 1015 BRIMFIELD IL
309-447 FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 DEER CREEK IL
309-448 FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 CONGERVL IL
309-449 FRONTIER NORTH, INC. - IL 1015 HOPEDALE IL
309-451 FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
309-452 FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
309-453 T-MOBILE USA, INC. 6529 PEORIA IL
309-454 FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
309-456 MCDONOUGH TEL. COOP. 1047 GOOD HOPE IL
309-457 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 MONMOUTH IL
309-458 ADAMS TEL. COOP. 0976 PLYMOUTH IL
309-462 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ABINGDON IL
309-463 FRONTIER NORTH, INC. - IL 1015 VARNA IL
309-464 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 NOHENDERSN IL
309-465 BRIGHTSPEED OF ILLINOIS, LLC 1057 AVON IL
309-467 FRONTIER NORTH, INC. - IL 1015 EUREKA IL
309-469 FRONTIER NORTH, INC. - IL 1015 SPARLAND IL
309-470 ILLINOIS BELL TEL CO 9329 PEORIA IL
309-471 ONVOY, LLC 224C SPARLAND IL
309-472 T-MOBILE USA, INC. 6529 PEORIA IL
309-473 FRONTIER NORTH, INC. - IL 1015 HEYWORTH IL
309-475 FRONTIER NORTH, INC. - IL 1015 SAYBROOK IL
309-476 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ANDOVER IL
309-477 BRIGHTSPEED OF ILLINOIS, LLC 1057 PEKIN IL
309-478 BRIGHTSPEED OF ILLINOIS, LLC 1057 PEKIN IL
309-479 FRONTIER NORTH, INC. - IL 1015 CASTLETON IL
309-482 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ALEXIS IL
309-483 ONEIDA TEL. EXCH. 1066 ONEIDA IL
309-484 MID CENTURY TEL. COOP., INC. 1054 ALTONA IL
309-486 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 LONDON ML IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/18/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.