1. DNS/PublicDNS
/8.8.8.8 /9.9.9.9 /CleanBrowsing /Google /OpenDNS /lifewire |
https://blog.thousandeyes.com/choosing-public-dns-resolver/
Free and Public DNS Servers /lifewire https://www.lifewire.com/free-and-public-dns-servers-2626062
Best free and public DNS servers of 2018 https://www.techradar.com/news/best-dns-server
Open DNS http://www.opendns.com/ (Cisco ?)
Google Public DNS http://code.google.com/speed/public-dns/
We tested 10 of the most popular public DNS providers: Comodo, DNS.WATCH, Dyn, FreeDNS, Google, Level 3, OpenDNS, OpenNIC, SafeDNS and Verisign. [Disclosure: Verisign is a ThousandEyes customer, as noted on their official website.
Akamai などの CDN用のDNSとの相性が悪いので、こんな提案もある。
http://googlecode.blogspot.com/2010/01/proposal-to-extend-dns-protocol.html
2. 公開情報
http://pcsupport.about.com/od/tipstricks/a/free-public-dns-servers.htm
3. Public ?
Public DNS Server List http://public-dns.info/nameserver/jp.html