DNS servers

OpenDNS

208.67.222.222

208.67.220.220

Comcast (Massachusetts clean)

68.87.71.226

68.87.73.242

Level 3 Communications

4.2.2.1

4.2.2.2

4.2.2.3

4.2.2.4

4.2.2.5

4.2.2.6

Google

8.8.8.8

8.8.4.4

UtlraDNS

156.154.70.1

156.154.71.1