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dhscott, thank you, but it isn't what I am looking for.
It is not so fast, and have a lot of superfluous functions...
I need just to cheсk domains, and to have a simple list of free of them.
They work as fast as you set them to work in the settings of the app, the .uk whois is limited to 1 query per second (I think) and a maximum of 1000 queries per rolling 24 hours.
If you just want to find out whether a .com/.net/.org is available, there are no checking limits on the first level whois server, which is rs.internic.net. If you need a full ("referred") whois ouptut, different registrars have different limits on their whois servers. PM me if you need any more info. I have written parsers for the output of several registrars over the years.