''All country codes" OR "All countries codes"

My dear and respected teachers

''All country codes" OR "All countries codes"

Hi twilit1988

It depends on the meaning you want to express. What is the context?

All country codes :tick:
All countries codes :tick:

I think the second would have to be:

All countries' codes. (The codes belonging to all countries.)

If you have a list of the codes used to make international telephone calls, it is a list of all country codes.