Comment Count Admin (by URL)

ENGLISH:

This plugin adds a handy feature to the WordPress admin pages to allow you to quickly identify anonymous first-time
comment authors by comment url. The comment count appears next to the comment authors name in the “Edit Comments”
listing of comments and in the “Discussion” box of the “Edit Post” page for a post with comments. Anonymous comment
authors are identified by the url they provided when commenting, all WordPress users are identified by their user id.