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
217-492 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-493 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHAMPAURBN IL
217-494 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SPRINGFLD IL
217-496 FRONTIER NORTH, INC. - IL 1015 SHERMAN IL
217-497 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DANVILLE IL
217-498 ILLINOIS BELL TEL CO 9329 ROCHESTER IL
217-499 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DANVILLE IL
217-510 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DANVILLE IL
217-511 MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
217-512 T-MOBILE USA, INC. 6529 CHARLESTON IL
217-514 MCC TELEPHONY LLC 593K MT AUBURN IL
217-519 T-MOBILE USA, INC. 6529 DECATUR IL
217-520 T-MOBILE USA, INC. 6529 DECATUR IL
217-521 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DECATUR IL
217-522 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-523 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-524 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-525 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-526 ILLINOIS CONSOLIDATED TEL. CO. 1037 MORRISONVL IL
217-527 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-528 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-529 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-531 PAETEC ITEL, LLC 829J CHAMPAURBN IL
217-532 ILLINOIS CONSOLIDATED TEL. CO. 1037 HILLSBORO IL
217-533 ILLINOIS CONSOLIDATED TEL. CO. 1037 IRVING IL
217-534 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 COFFEEN IL
217-535 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-536 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 WATSON IL
217-537 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 DONNELLSON IL
217-538 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 FILLMORE IL
217-539 FRONTIER COMMUNICATIONS-MIDLAND, INC. 1055 OCONEE IL
217-540 ILLINOIS CONSOLIDATED TEL. CO. 1037 EFFINGHAM IL
217-541 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-542 PAETEC ITEL, LLC 829J DECATUR IL
217-543 ILLINOIS CONSOLIDATED TEL. CO. 1037 ARTHUR IL
217-544 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-545 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-546 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-547 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-548 ILLINOIS BELL TEL CO 9329 FITHIAN IL
217-549 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHARLESTON IL
217-553 T-MOBILE USA, INC. 6529 SPRINGFLD IL
217-554 ILLINOIS BELL TEL CO 9329 DANVILLE IL
217-555 MULTIPLE OCN LISTING MULT DIR ASST IL
217-556 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITCHFIELD IL
217-557 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-558 ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
217-560 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHAMPAURBN IL
217-561 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 TAYLORVL IL
217-562 ILLINOIS CONSOLIDATED TEL. CO. 1037 PANA 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.