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
773-439 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN03 IL
773-440 METROPCS, INC. 5562 CHICGOZN10 IL
773-442 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN02 IL
773-443 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-444 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-445 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-446 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN06 IL
773-447 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-449 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN09 IL
773-450 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-451 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-452 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-453 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN11 IL
773-454 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-455 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN11 IL
773-456 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
773-457 T-MOBILE USA, INC. 6529 CHICGOZN07 IL
773-458 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN03 IL
773-459 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-462 ILLINOIS BELL TEL CO 9329 CHICGOZN11 IL
773-463 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-464 SPOK, INC. 6630 CHICGOZN01 IL
773-465 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-466 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN05 IL
773-467 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-468 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-469 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-470 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN08 IL
773-471 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-472 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-473 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-475 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN06 IL
773-476 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-477 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-478 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-479 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-480 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-481 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-483 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-484 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
773-485 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-486 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-487 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-488 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-489 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-490 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
773-491 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-493 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-495 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-497 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.