Servidores DNS primário e secundário

Google DNS 

8.8.8.8

8.8.4.4

Neustar DNS

156.154.70.1

156.154.71.1

Level3 DNS

4.2.2.1

4.2.2.2

Open DNS

208.67.222.222

208.67.220.220

Giga DNS 

189.38.95.95

189.38.95.96