Get Hostname from IP // MAC?!

I searched. No way documented. Easy to lookup hostname to IP. Gotta be the same reverse. Fing does it in android... now with these damn phones randomizing the MAC address, I need another data to track... is it possible?

What are you trying to achieve? What is your problem?

Network monitoring. Just see if something went down. Android renders MACs random, so can't track that anymore. Not important... It was aside thing