Here are some more Free DNS servers.
Here are a couple from Neustar: 156.154.70.1 and 156.154.71.1.
Here a couple that are from RCN: 207.172.3.8, 207.172.3.9, 207.172.3.11 and 207.172.3.10.
Here a few that I got from various WiFi networks that I have used in the past few years:
- 4.2.2.1, 4.2.2.2
- 12.127.16.67
- 64.134.255.2, 64.134.255.10, 64.132.94.250
- 199.2.252.10
- 204.117.214.10, 204.97.212.10
- 208.67.222.222, 208.67.220.220
- 209.18.47.61, 209.18.47.62
- 209.198.128.11
- 216.130.241.66, 216.136.95.2
Image from an 12th century manuscript housed at Universitätsbibliothek in Basel (Wikipedia page here), image from e-Codices, assumed allowed under Fair Use.