% host whois.geektools.com
Host whois.geektools.com not found: 3(NXDOMAIN)
i guess i missed the memo 
randy
Loads for me and just has a "we're shutting down notice", copied below.
But, like they say, modern whois knows where to look, no need to use anything else, I think as long as you're not stuck trying to use macOS or something else shipping weird ancient un-updated unix tools.
Matt
geektools.com has shut down.
We started this service in 1998 as the first smart whois that would automatically query the correct server(s) to get the data you need. A lot has changed since then and it's time to move on. Most modern command line clients on *nix-like systems will select the appropriate whois server. Check your system's man page ("man whois" for those of you who don't know what a man page is). If you prefer to use a browser interface there are many sites that perform the same function and they're easy to find with your favorite search engine.
It's been a good run, and thanks for using this service over the years.
- the geektools team
It appears that Matt Corallo <nanog@as397444.net> said:
But, like they say, modern whois knows where to look, no need to use anything else, I think as long
as you're not stuck trying to use macOS or something else shipping weird ancient un-updated unix tools.
If you're inclined to roll your own, I keep a set of whois server
pointers at <tld>.whois.services.net so for example
aero.whois.services.net is a CNAME for the whois server for .aero. I
update it daily using a the info in the IANA database and a bunch of
kludges to fill in the gaps.
There's a similar set at <tld>.whois-servers.net which seems to be
less up to date.
R"s,
John
PS: Someday I'll do it for rDNS, too.