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
309-493 FRONTIER NORTH, INC. - IL 1015 CAMPGROVE IL
309-494 ILLINOIS BELL TEL CO 9329 PEORIA IL
309-495 ILLINOIS BELL TEL CO 9329 PEORIA IL
309-496 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 HAMPTON IL
309-497 ILLINOIS BELL TEL CO 9329 PEORIA IL
309-507 UNITED STATES CELLULAR - IL 6265 GENESEO IL
309-510 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 PEORIA IL
309-511 MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
309-517 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MOLINE IL
309-521 CAMBRIDGE TEL. CO. 0983 ANDOVER IL
309-522 CAMBRIDGE TEL. CO. 0983 OSCO IL
309-523 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 PORT BYRON IL
309-524 ILLINOIS BELL TEL CO 9329 MOLINE IL
309-525 UNITED STATES CELLULAR - IL 6265 KEWANEE IL
309-526 FRONTIER COMMUNICATIONS OF ORION, INC. 1067 ORION IL
309-527 CONSOLIDATED COMMUNICATIONS OF CENTRAL ILLINOIS 1004 EL PASO IL
309-528 AMERICAN MESSAGING SERVICES, LLC 9748 BLOOMINGTN IL
309-529 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ALPHA IL
309-530 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BLOOMINGTN IL
309-531 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BLOOMINGTN IL
309-532 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BLOOMINGTN IL
309-533 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BLOOMINGTN IL
309-534 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 PREEMPTION IL
309-535 BRIGHTSPEED OF ILLINOIS, LLC 1057 TOPEKA IL
309-537 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ELIZA IL
309-538 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 KILBOURNE IL
309-542 ONVOY SPECTRUM, LLC 624H MCLEAN IL
309-543 BRIGHTSPEED OF ILLINOIS, LLC 1057 HAVANA IL
309-544 SKYE TELECOM LLC DBA SKYETEL 622J MACOMB IL
309-545 BRIGHTSPEED OF ILLINOIS, LLC 1057 TALBOTT IL
309-546 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 BATH IL
309-547 ILLINOIS BELL TEL CO 9329 LEWISTOWN IL
309-555 MULTIPLE OCN LISTING MULT DIR ASST IL
309-556 FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
309-557 FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
309-558 ILLINOIS BELL TEL CO 9329 ROCKISLAND IL
309-562 CASS TELEPHONE COMPANY 0984 EASTON IL
309-563 BRIGHTSPEED OF ILLINOIS, LLC 1057 CAMERON IL
309-565 ILLINOIS BELL TEL CO 9329 HANNA CITY IL
309-566 ILLINOIS BELL TEL CO 9329 PEORIA IL
309-567 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 PEORIA IL
309-568 ONVOY, LLC 224C ANDOVER IL
309-572 FRONTIER NORTH, INC. - IL 1015 MOSSVILLE IL
309-573 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 PEORIA IL
309-576 FRONTIER NORTH, INC. - IL 1015 MOSSVILLE IL
309-577 FRONTIER NORTH, INC. - IL 1015 MOSSVILLE IL
309-578 FRONTIER NORTH, INC. - IL 1015 MOSSVILLE IL
309-579 FRONTIER NORTH, INC. - IL 1015 MOSSVILLE IL
309-582 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ALEDO IL
309-584 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 JOY 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.