There is a new and more secure IP-endpoint-filter out! The new one is more secure and the old one will be retired after a while. So, if you are using IOTHub in your solution, you need to upgrade!

Nevertheless, test the filter in your development environment, before rolling it out in production.
It should normally not have any negative effects, if you are using the endpoints in a standard way, but one only ever knows after trying it out.
🙂

Alexander