Some external DNS servers

Google

8.8.8.8
8.8.4.4

Level 3 Communications (Broomfield, CO, U.S.)

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, U.S.)

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, U.S.)

192.76.85.133
206.124.64.1

One Connect IP (Albuquerque, NM, U.S.)

67.138.54.100

OpenDNS (San Francisco, CA, U.S.)

208.67.222.222
208.67.220.220

Exetel (Sydney, AU)

220.233.167.31

VRX Network Services (New York, NY, U.S.)

199.166.31.3

SpeakEasy (Seattle, WA, U.S.)

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, U.S.)

199.2.252.10
204.97.212.10
204.117.214.10

Cisco (San Jose, CA, U.S.)

64.102.255.44
128107241185

OpenNIC

202.83.95.227 (au)
119.31.230.42 (u)
178.63.26.173 (of)
217.79.186.148 (of)
27.110.120.30 (nz)
89.16.173.11 (uk)
69.164.208.50 (us)
216.87.84.211 (us)
2001:470:8388:10:0:100:53:20 (us)
2001:470:1 f10: c6: 2 (us)