OpenDNS
208.67.222.222
208.67.220.220
http://www.opendns.com/opendns-ip-addresses/

Dyn
216.146.35.35
216.146.36.36
http://setup.dynguide.com/

Level3
4.2.2.1
4.2.2.2
4.2.2.3
http://www.level3.com

SmartViper
208.76.50.50
208.76.51.51
http://www.markosweb.com/free-dns/

Google
8.8.4.4
8.8.8.8
http://code.google.com/speed/public-dns/

Comodo
8.26.56.26
8.20.247.20
http://www.comodo.com/secure-dns/

SafeDNS
195.46.39.39
195.46.39.40
https://www.safedns.com/features/

Public Root DNS Servers
46.244.10.70 (France)
46.244.10.98 (Australia)
46.244.10.116 (Singapore)
46.244.10.5 (The Netherlands)
79.172.201.120 (Hungary)
80.252.121.2 (UK)
82.146.40.113 (Russian)
122.183.133.220 (India)
128.65.160.37 (Iran)
199.5.157.131 (Chicago)
200.37.61.62 (Peru)
208.71.35.137 (Des Moines)
209.97.202.107 (Canada)