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
773-266 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-267 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-268 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-269 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN04 IL
773-271 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-272 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN03 IL
773-273 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-274 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-275 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-276 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-277 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-278 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-279 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-280 T-MOBILE USA, INC. 6529 CHICGOZN06 IL
773-281 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-282 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-283 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-284 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-285 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-286 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-287 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-288 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-289 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN04 IL
773-290 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
773-291 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-292 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-293 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-294 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
773-295 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN05 IL
773-296 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-297 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-298 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-299 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN06 IL
773-301 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-303 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
773-304 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN03 IL
773-305 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN04 IL
773-306 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN08 IL
773-307 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-308 FIRST COMMUNICATIONS, LLC 460K CHICGOZN03 IL
773-309 PAETEC ITEL, LLC 829J CHICGOZN05 IL
773-311 MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
773-312 T-MOBILE USA, INC. 6529 CHICGOZN02 IL
773-313 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
773-314 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN03 IL
773-315 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-316 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-317 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-319 T-MOBILE USA, INC. 6529 CHICGOZN10 IL
773-320 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.