generate a random ipv6 address

randomIPv6.js

// Generate a Random Mac
function randomMac() {
 return "XX:XX:XX:XX:XX:XX".replace(/X/g, function() {
   return "0123456789ABCDEF".charAt(Math.floor(Math.random() * 16)) 
  }
 )
};

// Generate IPv6 EUI64 
function ip6eui(prefix,mac) {
 return "".concat (prefix,
  ":",
  mac.split(":")[0] ^ 2, mac.split(":")[1],
  ":",
  mac.split(":")[2], "ff",
  ":",
  "fe", mac.split(":")[3],
  ":",
  mac.split(":")[4], mac.split(":")[5]
 );
};

prefix='2001:db8:'
console.log(ip6eui(prefix,randomMac() ));