OpenDNS

IPv4

• 208.67.222.222
• 208.67.220.220

Google Public DNS

IPv4

• 8.8.8.8
• 8.8.4.4

IPv6

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

Level 3 DNS

Norton ConnectSafe DNS

OpenNIC DNS

Reference

• Best Free Public DNS Servers