DNS Servers
Usually there are two DNS Servers
Prefered DNS server : 5.135.165.179
Alternate DNS server : 8.8.8.8
Here 8.8.8.8 is the Public DNS service provided by Google.
So best way to protect yourself is by using DNS servers of your ISP or OpenDNS
BSNL DNS Server 1 : 218. 248.240.208
BSNL DNS Server 2 : 218. 248.240.23
or
OpenDNS Server1 : 208.67.222.222
OpenDNS Server2 : 208.67.220.220
More detailed reasoning at How you have no privacy from Google and other service providers