Whois API which original company provides it?

Who actually provides the Whois API? Is it ICANN?

If you search whois API there are many results one among theme is:

Their charges are expensive. I believe they must be using some API too, but all these searches should be coming from third-party servers.

who is that third-party server?

Not sure but maybe the data might be originating from the domain registrars.

Vinit Patil,

Domain registrars also communicate to some third party servers.

1000 per month for free doesn’t sound expensive to me.
If you are offering it as a service and charging your customers, it sounds a great deal to me.

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That was not a question of where can I get API?

I mean these records must be kept somewhere in some primary database. Is it ICANN who does it? I mean these people must be fetching these records from some central database where all such records are kept.

Each country has its own set of domains, ICANN administers the main .com and .org domains, while in the UK Nominet does the .uk variants. Although I suspect that some of the much smaller countries use a shared regional administrator.

Yes, there are more places than the US, more administrators than just ICANN, and more TLDs than just .com and .org

So the whois tool should first check the type of TLD and then go to the authorising country’s administrator and search that database. I’ve just searched for a .com that a client owns, and it tells me that it is registered via tucowsdomains.com and quotes ICANN, although it was bought from a uk registrar (and it tells me that as well). But when I search for the same client’s .co.uk domain, it gets it from Nominet, and the domain was bought via the same uk registrar.

Finally, this might help you - https://en.wikipedia.org/wiki/WHOIS

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