iOS. get other device/computer name by IP in the same local network

Question

One task of my program is to scan local wi-fi network for any devices/computers in same network. I found solution to get all working devices IPs, but did not managed to get name

Answer 1

BOOL succeeded = CFHostStartInfoResolution(hostRef, kCFHostNames, NULL); Now I encounter that always failed at this line, and I tried to use getnameinfo function, it is still can't get the hostname