ionic serve displays multiple addresses and I chose wrong one…How to change address that ionic serve uses?

You can use the ionic address command to update the selected address, which is available from Ionic 1.2.3.

Also, there is a file called ionic.config which you can modify with this setting. On Mac/ubuntu this file is at ~/.ionic. On a PC it can be found at c:/users/username/.ionic. Inside you’ll see something like this which you can edit the ionicServeAddress value.

{
  "ank": "...",
  "versionCheck": 1413143560174,
  "ionicServeAddress": "localhost"
}