Get IP Address in ASP.NET Core 5

For user OS system type, you can use User-Agent in request headers:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36 Edg/93.0.961.38

For example the above value means Windows 10 x64 edition. 

As there are many browsers and many system types and versions, it is not easy to do a holistic parsing. What you can do is to find out the most useful ones for you based on each browser User-Agent definitions. 

For client local user machine name, it is not sent to the server in the request unless you are using Windows Authentication. Even for this authentication type, it doesn't necessarily represent the actual user name as user can use Run As to impersonate users.

Configure Windows Authentication in ASP.NET Core | Microsoft Docs

And then you can use the following approach in Razor Pages or Controllers to get user name:

string userName = HttpContext.User.Identity.Name;