I’m writing a program which manage a series of computers in the network

Sometimes we notice that the maximum network speed drops from 1 gb/s to 100 mb/s or that a segment gets disconnected

My program can already detect when a segment gets disconnected, but i also would like to monitor the network speed. Because we transfer huge amounts of data this reduced speed is a real issue

Is there a way to see whats the maximum speed if i have the IP adres?