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
773-498 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN08 IL
773-502 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-504 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-505 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-506 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-508 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-509 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-511 MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
773-513 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-515 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-516 PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN02 IL
773-517 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-518 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-519 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-520 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-521 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-522 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-523 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-524 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN04 IL
773-525 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-527 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN03 IL
773-528 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-529 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-531 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-532 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-533 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-534 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-535 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-536 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-538 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-539 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-541 LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
773-542 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-544 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-545 ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
773-546 ILLINOIS BELL TEL CO 9329 CHICGOZN10 IL
773-547 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
773-548 ILLINOIS BELL TEL CO 9329 CHICGOZN07 IL
773-549 ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
773-550 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
773-551 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
773-552 T-MOBILE USA, INC. 6529 CHICGOZN01 IL
773-553 ILLINOIS BELL TEL CO 9329 CHICGOZN06 IL
773-555 MULTIPLE OCN LISTING MULT DIR ASST IL
773-556 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-557 PAETEC ITEL, LLC 829J CHICGOZN03 IL
773-561 ILLINOIS BELL TEL CO 9329 CHICGOZN02 IL
773-562 T-MOBILE USA, INC. 6529 CHICGOZN03 IL
773-564 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN02 IL
773-566 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.