An iDevice can have two IP addresses . When connected to a router an iPhone will have an Internal IP and an External IP .
Internal IP : This is the IP address assigned to an iPhone iPod Touch and iPad by the router to which it is connected . To find the internal IP of an iPhone , go to Settings > WiFi . Select the device you are connected to and it will show you the IP address as shown below .
External IP : This is the IP address of the device assigned by the ISP or Internet Service Provider . To find this , launch Safari browser and open the webpage WhatIsMyIP.org . This will display your iPhone IP address on screen .