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
773-811 MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
773-813 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-818 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-819 ONVOY, LLC 224C CHICGOZN07 IL
773-820 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-821 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-822 T-MOBILE USA, INC. 6529 CHICGOZN06 IL
773-823 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN06 IL
773-824 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN03 IL
773-825 ILLINOIS BELL TEL CO 9329 CHICGOZN11 IL
773-826 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-827 T-MOBILE USA, INC. 6529 CHICGOZN06 IL
773-828 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
773-829 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN04 IL
773-830 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN05 IL
773-831 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN11 IL
773-832 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-833 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-834 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-835 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-836 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-838 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-841 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-843 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-846 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-847 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-848 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-852 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-854 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-855 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN07 IL
773-856 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN02 IL
773-857 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN04 IL
773-859 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-860 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-862 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-863 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-864 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-866 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-867 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-868 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-869 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-871 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-873 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-874 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-878 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-879 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-880 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-881 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-882 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-883 ILLINOIS BELL TEL CO 9329 CHICGOZN04 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.