Send to your LISTSERV system this command: query * for [log in to unmask] substituting the particular email address of interest, of course. This will return, for every list on the site that you have Owner level privilege for, information about that subscriber. Also, you can send this: query * for *@domain.com to get, for every list that you have Owner privilege for, information about every subscriber from "domain.com" To be sure you get ALL information about a particular subscriber (or domain), you must ask your LISTSERV site administrator to participate in the project. >>> "Harpe, Shawn" <[log in to unmask]> 10/22/09 12:01 PM >>> I am trying to figure out what list a particular user belongs to or even what list a particular domain belongs to. Does anyone know how to do this? Thanks Shawn Harpe Enterprise Senior System Administrator Server Administration Oklahoma State University 405-744-6724