For AirPort Extreme and AirPort Time Capsule base stations with 802.11ac.
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Alternative downloads

AirPort Utility
FREE
rating

Note: Most recent release available only within OS X 10.11 El Capitan update.

AirPort Admin Utility
FREE
rating

AirPort is a software supports the original Apple AirPort Graphite and Snow.

BwanaDik
FREE
rating

IP address (WAN and LAN) menu item. Yes, another IP address app. Just what the world needs.