js获取dns解析的IP端口

const DNS = require('dns');
const net = require('net');

function getIPAndPort(domain) {
  DNS.resolve(domain, (err, addresses) => {
    if (err) {
      console.error('DNS resolution failed:', err);
      return;
    }

    const ip = addresses[0];
    const socket = net.connect({ host: ip, port: 80 });

    socket.on('connect', () => {
      const port = socket.localPort;
      console.log(`The IP address of ${domain} is ${ip} and the port is ${port}`);
      socket.end();
    });

    socket.on('error', (err) => {
      console.error('Connection failed:', err);
    });
  });
}

getIPAndPort('example.com');