The modifications in version 2.1.1 of rxwhois.cmd include the addition of whois.nic.asia, whois.nic.bi, whois.adsib.gob.bo, whois.registry.gy, whois.nic.ht, whois.nic.im, whois.kcce.kp, whois.nic.mq, whois.nic.org.mt, whois.nic.pr, whois.co.ug, and vunic.vu from the usual sources: IANA, whois-servers.net, guesswork.
Lost in space: whois.nic.ki, whois.nic.tel, and whois.cctld.uz. Some domain grabbers in the TLDs CM, FM, GD, KN, and PN were ignored. Eleven other whois.whatever.tld hosts were added, but these are (yet) no whois servers. The rxwhois manual page contains the version history up to 2.1 over the last six years.