NumberResearchRecent prefix assignments
371 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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
New assignments by month
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Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 773-637 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN05 | IL | |
| 773-638 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL | |
| 773-643 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN07 | IL | |
| 773-645 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL | |
| 773-646 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL | |
| 773-650 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL | |
| 773-651 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN07 | IL | |
| 773-652 | SPOK, INC. | 6630 | CHICGOZN01 | IL | |
| 773-653 | PAETEC ITEL, LLC | 829J | CHICGOZN03 | IL | |
| 773-658 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN05 | IL | |
| 773-659 | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL | |
| 773-660 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN10 | IL | |
| 773-662 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | CHICGOZN01 | IL | |
| 773-663 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-665 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL | |
| 773-667 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN07 | IL | |
| 773-671 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-676 | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN05 | IL | |
| 773-681 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN02 | IL | |
| 773-684 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN07 | IL | |
| 773-685 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL | |
| 773-686 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN11 | IL | |
| 773-687 | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN04 | IL | |
| 773-689 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | CHICGOZN01 | IL | |
| 773-693 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL | |
| 773-694 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN11 | IL | |
| 773-695 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL | |
| 773-696 | PAETEC ITEL, LLC | 829J | CHICGOZN06 | IL | |
| 773-700 | IL | ||||
| 773-702 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN07 | IL | |
| 773-711 | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | IL | |
| 773-713 | AMERICAN MESSAGING SERVICES, LLC | 9748 | CHICGOZN02 | IL | |
| 773-714 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL | |
| 773-716 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-718 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | CHICGOZN01 | IL | |
| 773-719 | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL | |
| 773-720 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | CHICGOZN01 | IL | |
| 773-721 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL | |
| 773-722 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL | |
| 773-723 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN07 | IL | |
| 773-725 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL | |
| 773-728 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL | |
| 773-730 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL | |
| 773-731 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL | |
| 773-732 | T-MOBILE USA, INC. | 6529 | CHICGOZN03 | IL | |
| 773-734 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL | |
| 773-735 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN08 | IL | |
| 773-736 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL | |
| 773-737 | ILLINOIS BELL TEL CO | 9329 | CHICGOZN08 | IL | |
| 773-739 | T-MOBILE USA, INC. | 6529 | CHICGOZN02 | 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.