Download AirPort Utility 6.3.1 for Mac
Use AirPort Utility to set up and manage your 802.11n and 802.11ac AirPort base stations, including AirPort Express, AirPort Extreme, and AirPort Time Capsule. AirPort Utility 6.3.1 resolves an issue where AirPort base stations may not appear in AirPort Utility.
For the latest information on AirPort software, check Software Update in System Preferences or the following Apple Support Downloads website: http://support.apple.com/downloads/.
Learn more about Apple Wi-Fi at: http://www.apple.com/wifi/.
For more information on using AirPort products, go to the Product Support Page at: http://www.apple.com/support/airport/