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I needed to collect certain information from domain certificate, i was looking into "whois" but it gives a "TLD has no whois server" in certain cases.

Also does the information provided in the certificate differ for different domains?

And is there a limit in using whois from a ip? If yes what is it in term of concurrency and the number of times it can be queried ?

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A few questions.

  • What "certain information" are you trying to retrieve?

  • By "certificate" do you mean an SSL certificate? Or do you just want the domain registration information? This isn't clear in your question.

  • Do you have examples of the domains/TLDs that aren't working?

Yes, some domain registrars limit the total number of WHOIS looksup per-IP. The limit is down to them. You'd need to give examples to find out more.

Just a stab in the dark here - you're not trying to domain-snipe are you?

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  • The certain details would include the registraion date, its expiry, the domain registrar name, the status of the website etc. I just want the domain registration details and not the ssl certificate. Try whois for any .bt domain to get the "TLD has no whois server" error. I am not trying to do a domain snipe.
    – Kelvin K
    Jul 7, 2011 at 5:15
  • The full error I get is "This TLD has no whois server, but you can access the whois database at nic.bt". In this case they've provided their own interface to the whois database (probably so they can control the information more). One solution would be to script something which POSTs a query to their website and parses the result. But in short, unless they provided a public WHOIS server, the standard WHOIS tool won't work.
    – Coops
    Jul 7, 2011 at 9:12

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