The current registrars for ".ai" are below and growing fast:
  1. 101domain.com
  2. instra.com (OnlyDomains)
  3. marcaria.com
  4. nameaction.com
  5. idcicp.com
  6. quyu.net
  7. markmonitor.com
  8. 1api.net
  9. ai-domain.com
  10. zhuce.ai
  11. EPAG Domainservices GmbH
  12. EU Technology(HK) Limited
  13. Domain Club
  14. bNamed.net
  15. Tool Domains
  16. Nameshield
  17. 007Names
  18. Netz0
  19. zenaida.cate.ai
  20. Porkbun.com
  21. Namecheap.com
  22. NameSilo.com
  23. InternetX.com
  24. Spaceship.com
  25. Nom-IQ Ltd t/a Com Laude
  26. VentraIP
  27. Hosting Concepts B.V t/a Openprovider

    To be on this list a registrar just has to handle ".ai" registrations, renewals, and transfers (in and out).

    One FAQ related to registrars:

    The company Godaddy will say "domains with this extension are not transferable" when someone tries to transfer a ".ai" domain to them when a more correct error message would be "Godaddy does not know how to transfer .ai domains even though it is done using the industry standard EPP transfer command". They will also say, "Technically .ai domains are not transferable between most registrars, but we have a dedicated team that transfers them manually." This is so wrong. All other registrars have no trouble doing them automatically. The only technical failure is at Godaddy. Because of they way Godaddy is doing this, I get many people asking me, "Vince, why don't you let people transfer .ai domains?", as if I was doing something wrong and not Godaddy. I do let people transfer .ai domains. All of the above registrars can do it automatically without any trouble. Really.