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
773-568 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-569 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-570 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN11 IL
773-572 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN04 IL
773-573 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
773-575 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
773-576 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-578 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-579 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-580 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
773-581 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-582 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-583 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-584 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN06 IL
773-585 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-586 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-588 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-589 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-590 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-591 ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
773-592 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-593 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-594 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-598 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN04 IL
773-599 ONVOY, LLC 224C CHICGOZN08 IL
773-601 ILLINOIS BELL TEL CO 9329 CHICGOZN11 IL
773-602 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-604 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-607 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-608 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-609 ONVOY, LLC 224C CHICGOZN10 IL
773-611 MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
773-612 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-613 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-616 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-617 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-618 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-620 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
773-622 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-623 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-624 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-625 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-626 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-628 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN03 IL
773-631 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-632 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN03 IL
773-633 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
773-634 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN04 IL
773-635 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN06 IL
773-636 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 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.