IP Address to Binary Conversion by JavaScript

const fullip = "172.16.20.51/24";
const ip = fullip.split('/')[0];
const subnet = fullip.split('/')[1];
const ipslipt = ip.split('.');
const binaryIp = [];
const netAdreess = Math.pow(2, subnet);
const hostAdress = Math.pow(2, (32-subnet));

ipslipt.map(item=>{
  let singleIp = parseInt(item).toString(2);
  if(singleIp.length < 8){
    let shortestIp = 8 - (singleIp.length);
    for(let i = 1; i <= shortestIp;i++){
      singleIp = 0 + singleIp;
    }
  }
  binaryIp.push(singleIp);
});

console.log("Binary IP: " + binaryIp.join('.'));
console.log("Network Address: " + netAdreess);
console.log("Host Address: " + hostAdress);