A simple ruby eventmachine daemon that resolves ips to respective contact email addresses looked up from public whois databases.
$ telnet localhost 8080
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Welcome to WhoisEmailLookupServer
82.134.73.70
["thomas@kolsto.no"]
Commited from my collection of random code snippets.