what is Google Public DNS?
Google Public DNS is a free, global Domain Name System (DNS) resolution service, that you can use as an alternative to your current DNS provider.
To try it out:
Configure your network settings to use the IP addresses 220.127.116.11 and 18.104.22.168 as your DNS servers or
Read our configuration instructions.
If you decide to try Google Public DNS, your client programs will perform all DNS lookups using Google Public DNS.