The purpose of a DNS server is to enable people and applications to lookup records in DNS tables.

A few domain name servers on the Internet provide DNS resolutions for anyone who requests it of them. These are known as “Public DNS Servers.”  Listed below are several

Public DNS Servers
Level 3 Communications (Broomfield, CO, US)
4.2.2.1
4.2.2.2
4.2.2.3
4.2.2.4
4.2.2.5
4.2.2.6

Verizon (Reston, VA, US)
151.197.0.38
151.197.0.39
151.202.0.84
151.202.0.85
151.202.0.85
151.203.0.84
151.203.0.85
199.45.32.37
199.45.32.38
199.45.32.40
199.45.32.43
GTE (Irving, TX, US)
192.76.85.133
206.124.64.1
One Connect IP (Albuquerque, NM, US)
67.138.54.100

OpenDNS (San Francisco, CA, US)
208.67.222.222
208.67.220.220

Exetel (Sydney, AU)
220.233.167.31

VRx Network Services (New York, NY, US)
199.166.31.3

SpeakEasy (Seattle, WA, US)
66.93.87.2
216.231.41.2
216.254.95.2
64.81.45.2
64.81.111.2
64.81.127.2
64.81.79.2
64.81.159.2
66.92.64.2
66.92.224.2
66.92.159.2
64.81.79.2
64.81.159.2
64.81.127.2
64.81.45.2
216.27.175.2
66.92.159.2
66.93.87.2

Sprintlink (Overland Park, KS, US)
199.2.252.10
204.97.212.10
204.117.214.10

Cisco (San Jose, CA, US)
64.102.255.44
128.107.241.185