Not my device
How can I find out the IP address of this device iPhone 8 plus I don't recall ever having this device
iPhone 8 Plus
You’ve selected iPhone 8 Plus
iPhone 8 Plus
Question marked as
I don't recall ever having this device
Check if it is indeed not your iPhone, see this Apple article: Check your Apple ID device list to see where you're signed in
https://support.apple.com/en-us/HT205064
How can I find out the IP address of this device iPhone 8 plus
It is only possible if it is your own iPhone.