Google Public DNS

https://developers.google.com/speed/public-dns/
Google Public DNS

Google Public DNS is a Domain Name System (DNS) service offered to Internet users worldwide by Google. It functions as a recursive name server. 

Google Public DNS was announced on December 3, 2009, in an effort described as "making the web faster and more secure."

IPv4
Primary DNSSecondary DNS
8.8.8.88.8.4.4
IPv6
Primary DNSSecondary DNS
2001:4860:4860::88882001:4860:4860::8844

BTmimi - Free Public DNS Servers List