A wildcard A record in the net TLD. $ host does.really-not-exist.net does.really-not-exist.net has address 64.94.110.11
$ host 64.94.110.11
11.110.94.64.IN-ADDR.ARPA domain name pointer sitefinder-idn.verisign.com
It even responds on port 25 (says 550 on every RCPT TO). Gah.
-- Niels.
