How to find NI number

Hoping for guidance. Born in UK, lived there for 9 years, presume Mum claimed Child Benefit and I was issued with an NI number. Worked for a period in the UK in 1992 and definitely paid tax and am paying tax in Irelandfor 30 years.. I don't have my NI number, don't have a UK address now so can't see how to get my NI number. Any help would be appreciated

Hi,
As you are overseas, please complete and return our form CA5403 which will ask for your details and enable us to try to trace a UK National Insurance Number for you.
You will find the CA5403 via Get your National Insurance number by post.
Thank you.