net module "socket.remoteAddress" value is wrong - node.js

Question

I create a TCP IVP4 socket server in Node.js using the 'net' module, and it works great for almost all of my clients, but one client has an IP similar to (I won't disclose the real one):
180.190.154.97
but when they connect to my socket server and I console.log(socket.remoteAddress), the value is this:
180.190.193.2
Why would this be happening?
// Import dependencies
let net = require('net')
// Create socket server.
const SERVER = net.createServer(socketConnection)
function socketConnection(client) {
console.log(client.remoteAddress)
}
// Server code snippet
let SERVER_LISTEN_ADDRESS = '0.0.0.0'
if (Game.local) {
SERVER_LISTEN_ADDRESS = '127.0.0.1'
Game.port = 42480
}
SERVER.listen(Game.port, SERVER_LISTEN_ADDRESS, () => {
console.log('Listening on port ' + Game.port)
if (!Game.local)
postServer()
else
console.log('Running server locally.')
})
Expected result is that it should print their IPV4 value from a site like:
https://whatismyipaddress.com/
But instead it says something completely different.

Answer 1

The result shown by whatipmyaddress it is not always the public IP of the single host. It could be rather also the IP of the subnet or if there's a proxy the IP of the proxy server. The fact that the address differs by a few units suggests that those particular hosts are in a subnet where a NAT service is active, or protected by a proxy or where the router acts as a VPN to the outside, encapsulating and sending the message to the server. In this case probably the entire subnet is seen as a single host.
In case you're using Express, you may want to use request-ip package in order to retrieve the IP in a more robust way. Since it seems you're not using express you should implement something similar to the first example shown in the link. For your specific case according the code you give:
const requestIp = require('request-ip');
function socketConnection(client) {
const clientIp = requestIp.getClientIp(client);
console.log(client);
}