dnsbl.info used to provide two tor-related lists: (1) all nodes and (2) exits. Some webmasters could use the first one by mistake.
https://www.dan.me.uk/dnsbl still does, and some webmasters do use the first one.
Link related to this thread characterizing some blocking...
https://trac.torproject.org/projects/tor/wiki/org/doc/ListOfServicesBlocking... https://trac.torproject.org/projects/tor/wiki/org/projects/DontBlockMe