Checking IP And Port Of Switch / Router That Links To Remote Device

Our company has setup several remote devices that link to a switch Whenever there are problems on the device, some technicans will replace it using a new one We have a vb program that can automatically update the device setup in our server when technicans replace devices. So we do not need to login and update the setting manually However, our program cannot handle the case that there are more than 1 device that need replacement Therefore, our idea is to retrieve the ip and port of the router/switch that links to remote device using VB.net.