https://bgp.he.net/irr/route-set/RS-AUTHDNS-ANYCAST
RS-AUTHDNS-ANYCAST - bgp.he.net
rsauthdnsanycastbgp
https://www.pmwiki.org/wiki/Cookbook/AuthDNS
AuthDNS - Cookbook - PmWiki
Password-less authentication based on the visitor's IP address or (dynamic) hostname.
authdnscookbookpmwiki