Originally Posted by psychonic
Easiest would probably be with net_showevents enabled on the client. If you see it there, it's being networked (and recorded to demo).
I made a server demo of me reconnecting to a server twice in a row.
From my limited testing, the address or even the player_connect event wasn't recorded in the demo.
I only had two instances of:
userid: Byte (id:13)
This is using the csgo demoinfo tool.
Not sure if that is conclusive.
to check my test demo and the address field was empty in the player_connect event.