• [1] Root Server Technical Operations Assn http://www.root-servers.org/
• [2] 現在 A〜M まで13あります。

[4] RFC 2870 - Root Name Server Operational Requirements, 2021-04-11T08:57:17.000Z, 2021-04-12T10:04:30.036Z https://tools.ietf.org/html/rfc2870

[3] RFC 7720 - DNS Root Name Service Protocol and Deployment Requirements (2015-12-10 11:22:21 +09:00 版) https://tools.ietf.org/html/rfc7720