Idenitify a device by IP

Hi All,

I have an IP address on the network that when i go to my browser and type it in, it asks for login information and password.

I would like to know how do i identify this computer. The IP is 192.168.1.31 and we have a DHCP scope for everything between 192.168.1.33 – 254.

So i am wondering what this device is?

Is there some kind of command that allows me to identify the device by simply knowing its IP address?

Thankyou