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
773-380 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-381 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-383 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
773-384 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-385 ILLINOIS BELL TEL CO 9329 CHICGOZN05 IL
773-386 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-388 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-389 BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN09 IL
773-390 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-391 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-392 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-393 SPOK, INC. 6630 CHICGOZN01 IL
773-394 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-395 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-398 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-399 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-401 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-402 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-403 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-404 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-405 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-406 T-MOBILE USA, INC. 6529 CHICGOZN07 IL
773-407 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-409 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN02 IL
773-410 T-MOBILE USA, INC. 6529 CHICGOZN02 IL
773-411 MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
773-412 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-413 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN05 IL
773-415 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-416 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-417 COMCAST IP PHONE, LLC 318J CHICGOZN05 IL
773-418 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-419 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-420 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN07 IL
773-421 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-422 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-423 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
773-424 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN08 IL
773-425 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-427 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-428 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-429 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-430 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-432 FIRST COMMUNICATIONS, LLC 460K CHICGOZN08 IL
773-433 T-MOBILE USA, INC. 6529 CHICGOZN02 IL
773-434 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-435 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN04 IL
773-436 ILLINOIS BELL TEL CO 9329 CHICGOZN08 IL
773-437 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN09 IL
773-438 SPOK, INC. 6630 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.