IP address is an address assigned to your iPhone as it connects to a (wireless) network. Do as follows to find IP address on iPhone 5, iPhone 6s and other iPhone, iPad and iPod touch devices:
1. Make sure you are connected to a wireless network on your iPhone
2. Open the Settings app and tap to open the Wi-Fi settings.
3. Tap the i icon next to the wireless network you are connected to
4. There you should see the IP Address on your iPhone.