How to install .ipa to other ios devices

Hi folks, developed an ios app, (.ipa), now i want to give it to my users (this app is not public its confidential, I don’t know how many users are going to install it and where). How can i distribute it, like i can do with .appx and .apk like i generate them and send anybody and they can use it. So how about .ipa (ios).

Please help out.

Look into using Apple’s TestFlight for this.