If you are having difficulty locating the IP address of your hub, you might try using an IP address scanner. It will scan all the IP addresses of every device connected to your router.
I use a free scanner called Advanced IP Scanner. If you cannot identify which device is your hub, check the name plate on the hub for the MAC address and then match the MAC address to the IP address.
Once you figure out which address is being used, open the UI for your router and reserve that address for the hub so it will never change again.