There is a simple implementation of whois resolution but, there is no Rwhois support and some blacklist mechanism. More sofisticated resolution takes more time. There is appeal to be fast and as much precise as possible.
Rwhois protocol specification:
http://www.networksorcery.com/enp/protocol/rwhois.htm
https://tools.ietf.org/html/rfc2167
There is a simple implementation of whois resolution but, there is no Rwhois support and some blacklist mechanism. More sofisticated resolution takes more time. There is appeal to be fast and as much precise as possible.
Rwhois protocol specification:
http://www.networksorcery.com/enp/protocol/rwhois.htm
https://tools.ietf.org/html/rfc2167