Google DNS :

Primary DNS 8.8.8.8 

Secondary DNS 8.8.4.4

OpenDNS :

Primary DNS 208.67.222.222

Secondary DNS 208.67.220.220

Advantage DNS : 

Primary DNS 156.154.70.1 

Secondary DNS 156.154.71.1

ScrubIT :

Prmary DNS 67.138.54.100 

Secondary DNS 207.225.209.66

Comodo Secure DNS 

Primary 156.154.70.22

Secondary 156.154.71.22

How to use them (LINK)