NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

371 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)

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 31
NEW CINGULAR WIRELESS PCS, LLC - IL 31
NEW CINGULAR WIRELESS PCS, LLC - DC 30
ONVOY, LLC - NJ 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
773-741 ILLINOIS BELL TEL CO 9329 CHICGOZN11 IL
773-743 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-745 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-746 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-748 INDIANA PAGING NETWORK, INC. 6795 CHICGOZN10 IL
773-751 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
773-752 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-753 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-755 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-756 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN03 IL
773-758 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-760 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-761 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-762 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-763 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-764 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-765 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN02 IL
773-767 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-768 ILLINOIS BELL TEL CO 9329 CHICGOZN09 IL
773-769 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-770 PAETEC ITEL, LLC 829J CHICGOZN04 IL
773-771 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-772 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-774 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-775 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-776 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-777 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-778 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-779 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-780 T-MOBILE USA, INC. 6529 CHICGOZN08 IL
773-782 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-783 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-784 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-785 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-786 PAETEC ITEL, LLC 829J CHICGOZN05 IL
773-787 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN10 IL
773-788 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-790 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN03 IL
773-792 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-793 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-794 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-795 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-797 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN05 IL
773-799 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN04 IL
773-802 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-804 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-805 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-806 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-808 T-MOBILE USA, INC. 6529 CHICGOZN07 IL
773-810 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL

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.