I always liked the RP DNS record (https://www.rfc-editor.org/rfc/rfc1183 https://www.rfc-editor.org/rfc/rfc1183) but no one seems to know about it or use it any

I always liked the RP DNS record (https://www.rfc-editor.org/rfc/rfc1183 https://www.rfc-editor.org/rfc/rfc1183) but no one seems to know about it or use it any more. The only reason my servers don't have one now is because route53 doesn't support it.