• [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, 4/11/2021, 8:57:17 AM, 4/12/2021, 10:04:30 AM https://tools.ietf.org/html/rfc2870

[3] RFC 7720 - DNS Root Name Service Protocol and Deployment Requirements (12/10/2015, 2:22:21 AM 版) https://tools.ietf.org/html/rfc7720