Blacklist check

orf.at

Enter an IPv4 address or a domain. For a domain, its mail servers are checked against common DNS blacklists.

Same in the terminal

$ curl tools.otw.solutions/blacklist/orf.at

'No answer' means the list refused or did not answer the query. Spamhaus, for example, blocks queries from large public resolvers. Delisting is done on each list's website.