If you want to have a customized Wifi Internet router IP address then follow these quick steps:
• D-Link == Access your admin panel > setup tab > network settings > Wifi router settings > router IP address > save settings.
• TP-Link == Login to your web interface > advanced > network > LAN > change as preferred in IP address feild > save changes. When the gateway IP address is changed then your Wifi router will restart with applied save changes.