request.connection.remoteAddress Now Prefixed in ::ffff in node.js

Question

I recently changed my router over to one provided by Google for Google Fiber (yay!) and now I am noticing a change in what I am seeing when I inspect request.connection.remo

Answer 1

re: #4, a library like ipaddr.js works well, e.g.:

var ipString = request.connection.remoteAddress;
if (ipaddr.IPv4.isValid(ipString)) {
  // ipString is IPv4
} else if (ipaddr.IPv6.isValid(ipString)) {
  var ip = ipaddr.IPv6.parse(ipString);
  if (ip.isIPv4MappedAddress()) {
    // ip.toIPv4Address().toString() is IPv4
  } else {
    // ipString is IPv6
  }
} else {
  // ipString is invalid
}