batch-await.js

const dns = require('dns').promises;

// how many parallel "workers" to use
let batchSize = 3;

// domain list to process
let domains = [
    'neti.ee',
    'hot.ee',
    'zone.ee',
    'telia.ee',
    'delfi.ee',
    'postimees.ee',
    'nali.ee'
];

async function main() {
    let results = [];
    while (domains.length) {
        let promises = [];
        for (let i = 0; i < batchSize && domains.length; i++) {
            let domain = domains.shift();
            if (domain) {
                promises.push(dns.resolveAny(domain));
            }
        }
        if (promises.length) {
            results = results.concat(await Promise.all(promises));
        }
    }
    console.log(results);
}

main();