You can add 184.108.40.206 to your whitelist right away. 220.127.116.11 belongs to Google and the bot operating from there is the real GoogleBot.
If you prefer to verify that 18.104.22.168 belongs to Google, you can launch a command shell and do a reverse IP lookup on 22.214.171.124 and then a forward DNS lookup on the host name returned from the reverse lookup:
As you can see the reverse lookup returns a .googlebot.com address, and the forward DNS requests brings us back with 126.96.36.199. We can now conclude that 188.8.131.52 is a real Googlebot.
For the last days I’ve been going through all traffic on the Freefixer.com web site. My goal is to reduce the traffic to the web site by blocking a bunch for uninvited bots and crawlers. I’ll try to share some of the result here and I hope you’ll find it useful.