Fwd: whois server features

Is there a list of NIC (and other popular whois server) features (what can be searched on) and what data they provide (and what title they give it)? A quick search yields: http://www.ripe.net/ripe/docs/ripe-358 https://www.arin.net/resources/whoisrws/whois_diff.html https://www.apnic.net/apnic-info/whois_search/using-whois/searching/query-op... (In declining order of information - I also couldn't find the info for AFRINIC queries) I also couldn't find information on what fields they have (and obviously how they map to one another). There are also a few other whois servers around that I have no idea about: https://www.opensource.apple.com/source/adv_cmds/adv_cmds-149/whois/whois.c