IP Address

An IP (Internet Protocol) Address is not a fixed address assigned to the device. An IP address is dynamic and automatically addressed by your Internet Service Provider to the main Router and then the Router assigns an IP address to your device. Each device on a Wi-Fi network has its own IP address assigned by the Wi-Fi Router. Unless you have a fixed IP address set up on your your device, the IP address will change routinely. Most people allow the IP address to be setup automatically which is the default setting on an iPhone.

To find the IP address of your iPhone, over a Wi-Fi Network:

Open Settings ➔ Wi-Fi ➔ Tap on the (i) to the right of your connected Wi-Fi Network ➔ IP Address: Here, you will see the IP address of your iPhone.

Axel F.

It is in settings > wifi > your network. You should see the current IP and an option to change it.

See this Apple article: Recommended settings for Wi-Fi routers and access points

https://support.apple.com/en-us/HT202068