According to Decree No.82 of the Ministry of Public Security, all units' Internet terminals must keep operation records in the process of surfing the Internet, so as to be well documented when any Internet terminal releases harmful information such as leaking secrets and endangering national image and security.
This is just a reference function.
But it depends on how local operators operate.
In short, there are too many devices that can check your internet access, even many softwares can do it (but generally you need to install a client).