net.reverse(ip)
Returns the fully qualified domain from an IP address (reverse DNS lookup).
Parameters
ip
The IPv4 or IPv6 address to perform the reverse DNS lookup.
Return value
Return a string representing the fully qualified hostname.Example
local console = require "console"
local net = require "net"
console.write('Enter IP adress : ')
local host = net.reverse(console.readln()) or "not found";
print('hostname : '..host)