How do I check my wifi ipv4 address?

I intend to sideload apps on my bbq10 and it keeps asking for the WiFi ipv4,i went to network under about to check but all to no avail

First of all, what apps are you attempting to sideload? If they're .bar files, okay... but if they're android .apk files, just download and install. Second, your wifi ip address is under Settings > About > Network, if you are currently connected to a wifi network with your device.