WebAPI to find the number of licensed device managed by Net MRI? [ Edited ]

[#1]

I'm writing a python webAPI script to calculate the 

1. #number of device limit of netMRI

2.# number of  active (used) licensed device managed by NetMRI?

I have been looking around and somehow got the first part resolved by this api call

https://xyz/api/3/basic_services/license_info?device_limit

I would appreciate if someone can guide me in the right direction to find out the second part of it.

I have checked authentication, Device Setting and System Setting sections but of not much help.

Thanks

Nidhi