Free Public DNS Servers

Google Public DNS IPv4 Addresses:

8.8.8.8
8.8.4.4

Google Public DNS IPv6 Addresses:

2001:4860:4860::8888
2001:4860:4860::8844

Level 3 Public DNS Server Addresses:

209.244.0.3
209.244.0.4
4.2.2.1
4.2.2.2
4.2.2.3
4.2.2.4

OpenDNS IP Addresses:

208.67.222.222
208.67.220.220

Norton DNS IP Addresses:
Option A:

199.85.126.10
199.85.127.10

Option B:

199.85.126.20
199.85.127.20

Option C:

199.85.126.30
199.85.127.30