I have an ASUS RT-AC66R and it gives me all that information and even allows me to export it. Depending on whether you use static IP addresses or DHCP, they shouldn't change often. I use DHCP and my desk phone's IP address has been the same for close to three years now.
Per our Tier 3 engineer
We do not track the internal IP address that their DHCP server assigns the phones.
They would be better off exporting the DHCP assignments from their DHCP server. It would have the internal IP as well as the MAC address which is the serial number of the phone.
I don't know if that will help at all, but that's what came to mind.