Registrar: Unknown (PIR-6065-IP)

I just bought a .org domain at dynadot and use cloudflare as DNS but it seems it cannot recognized the registar. I am planning to renew the domain in the future and fully migrate it to cloudflare. but how will this happen if cloudflare cannot recognized the registar?

That shouldn’t be much of an issue. In order to transfer it, just add it to Cloudflare and in sixty days (considering you just registered it) you can transfer it to Cloudflare if you want. The “Unknown” is rather just a display glitch.