How to detect the traffic of Messages in OS X?

Question

I want to know the the IP address where my package of Messages data are sent to.

I tried the OS X's Monitor, but it doesn't tell anything about port or IP. And I used nettop, there are also no information with name "Messages"

How should I do?

Answer 1

You can use Little snitch that will give you a graphical Network Monitor where you can select the Messages app and see what are the servers' IP Addresses (IPv4 or IPv6) that Messages app is connected to.

Note: You may also need to check imagent and apsd processes.

Nettop will also give you this information, just remember to look for imagent and apsd processes.