D and B apple iphone dev program:
For apple developer subscription, DUNS number is required. You may see the following link for getting it:
https://noobdevblog.wordpress.com/2014/09/03/get-d-u-n-s-number-for-free-and-fast-in-india/
https://support.apple.com/en-us/HT204154
directory - app developers
https://clutch.co/get-listed