如何在原生NodeJS中通过IP地址和端口获取域名？

Question

Which method is closest to desiredMethod in below code?

const dns = require("dns");

const IP_ADDRESS = "XX.XX.XXX.XXX"; // Any valid IP address
const PORT = 8080;

dns.deiredMethod(`${IP_ADDRESS}:${PORT}`, (error, domain) => {
   console.log(domain); // example output: "example.com"
})

Answer 1

Not quite sure if I understand correct what you try to achieve. But the native dns module of an Node.js installation allows to resolve hostnames by IP address and port using dns.lookupService(address, port, callback) . Please see Node.js DNS for details.

const dns = require("dns");

dns.lookupService('172.217.18.110', 22, (err, hostname, service) => {
    console.log(hostname, service);
});