RISwhois
Alert!
This web interface is going away soon. You can continue to use riswhois with
a whois command-line client, for example:
$ whois -h riswhois.ripe.net -- '-m 193/19'
RISwhois complements the RIS tools by providing a higher level view over the most recently collected set of routing tables from the Remote Route Collectors (RRCs). Given an IPv4 or IPv6 address, RISwhois will tell which prefixes and origin ASes on which RRCs match that particular IP.