https://datatracker.ietf.org/doc/html/rfc6891
RFC 6891 - Extension Mechanisms for DNS (EDNS(0))
Extension Mechanisms for DNS (EDNS(0)) (RFC 6891, )
rfc 6891extensionmechanismsdns
https://www.rfc-editor.org/info/rfc6891
Information on RFC 6891 ยป RFC Editor
rfc 6891informationeditor