Hi. I'm currently implementing a domain availability checker on my website. Everything works fine for all top level domains except .org

I tried using whois.publicinterestregistry.net and whois.pir.org, but both show available domains as taken (used nisar-utsi.org as example). I found other sites using domain checker and they had their .org domains working fine (for nisar-utsi.org).

Is there a way to find a working .org whois server? Or can I find out the whois server used for .org in the sites which are working fine?

Thanks in advance.

Nisar.

innocent bump!