iphone - How does iOS app Fing get MAC Address?

Question

I known Apple stopped MAC address API since iOS 7. But I just found the app Fing can get MAC address. How could it happen?

If I use samillar way to get MAC address, is it allowed by iTunes review?

BTW: the How to get iOS device MAC address programmatically doesn't really help. I need MAC address, not [UIDevice identifierForVendor].

Answer 1

Fing can only get the device's MAC address if the device is connected to a WiFi network. I suspect it implements an ARP scan on the local network and matches the known local IP address to determine the local MAC address.

There are some questions that address capturing ARP data here and here