How to identify the originator of an URL call under iOS/iPadOS?
If you have a jailbroken iOS/iPadOS device, you can use the command "lsof" to find out which process has that specific port open.

You would run it like this:

lsof -n -iTCP


It would list ports that the process has open with the mark "(LISTEN)" at the end. Outgoing connections would be marked differently depending on their state, typically "(ESTABLISHED)", "(CLOSED)" or various wait states.