what is correct format of bundle identifier in iOS?

Question

I have four bundle identifier

1. com.company.appname
2. com.appname
3. appname
4. com.company-name.app-name

Please help me to find out correct bundle identifier,
Please tell me which is correct.

Answer 1

All the formats which you have mentioned are correct and can be used as bundle identifier. But the standard format followed is com.company.appname (reverse domain name).