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
773-884 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-887 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN05 IL
773-889 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-890 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-892 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-893 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN06 IL
773-894 ILLINOIS BELL TEL CO 9329 CHICGOZN11 IL
773-896 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN07 IL
773-898 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-902 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN09 IL
773-905 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN10 IL
773-906 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN11 IL
773-907 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-908 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-909 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-910 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-911 MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
773-912 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN08 IL
773-913 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN09 IL
773-914 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-915 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN07 IL
773-917 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN11 IL
773-918 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-919 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-920 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN06 IL
773-921 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-922 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN05 IL
773-924 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-925 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-926 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-927 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-928 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-929 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-932 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN03 IL
773-933 ILLINOIS BELL TEL CO 9329 CHICGOZN09 IL
773-935 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-937 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN08 IL
773-938 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN04 IL
773-942 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
773-944 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN02 IL
773-947 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-948 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN08 IL
773-950 IL
773-955 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-957 PAETEC ITEL, LLC 829J CHICGOZN03 IL
773-958 IL
773-959 IL
773-960 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-961 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-962 ILLINOIS BELL TEL CO 9329 CHICGOZN07 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.