mini_xzey/app/Http/Middleware/IntranetAccess.php

<?php
declare(strict_types = 1);

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;

class IntranetAccess
{

    /**
     * @param Request $request
     * @param Closure $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next): mixed
    {
        $forwarded = $request->server("HTTP_X_REAL_IP");
        if(!empty($forwarded)){
            $ip = $forwarded;
        }else{
            $ip = $request->ip();
        }

        if(
            $ip != '::1' &&
            $ip != '127.0.0.1' &&
            !str_starts_with($ip, "10.") &&
            !str_starts_with($ip, "172.") &&
            !str_starts_with($ip, "192.")
        ) {
            return response('Not Found.', 404);
        }

        return $next($request);
    }

}