Public (Level3) Nameservers (these are OC192's)
4.2.2.1
4.2.2.2 (fast)
4.2.2.3
4.2.2.4
4.2.2.5
4.2.2.6 (fast)

Open to the Public 
# ns1.la.us.opennic.glue (New Orleans, LA, US) - 68.15.165.12
# ns1.phx.us.opennic.glue (Phoenix, AZ, US) - 63.226.12.96
# ns1.sfo.us.opennic.glue (San Francisco, CA, US) - 64.151.103.120 (fast)
# ns1.co.us.opennic.glue (Longmont, CO, US) - 216.87.84.209

SpeakEasy Nameservers
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 General DNS
204.117.214.10
199.2.252.10
204.97.212.10

Cisco
128.107.241.185
192.135.250.69