Hi Sachit,

this table stores the logged in users "v_user_session"; It stores User and whether the session is Active or not.

once user logs out the entry for that user is removed from this table.

So you can use this table with below query in REST API

Http Method: GET

Endpoint: https://instanceName.service-now.com/api/now/table/v_user_session?sysparm_query=active%3Dtrue

Mark ✅ Correct if this solves your issue and also mark 👍 Helpful if you find my response worthy based on the impact.
Thanks
Ankur