Unless they are in the Certified Category, drones do not need to be registered, but you, as drone operator/owner, must register yourself. You do so with the Irish Aviation Authority at https://iaa.mysrs.ie/auth/sign-in You register once, independently of how many drones you have operating in the ’open’ or the ’specific’ category. Your registration will be valid for a period of 5 years, after which you need to renew it. However, you do not need to register yourself if your drone(s):
Relevant regulation: article 21 of EU regulation 2019/947.
December 6, 2021