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I captured the request but it didn't tell me anything. There were 4 bytes of data transmitted and the value was 08010310.

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  • UDP port 192 is used for Apple’s AirPort base station discovery and configuration.
  • SystemUIServer is responsible for the menu bar icons, including the AirPort Wi-Fi icon and its information about the wireless connection.

According to http://hints.macworld.com/article.php?story=20110105044728511, this menu bar item requests information about wireless connections to display that information in the menu bar item, and that disabling this icon stops the connections on port 192 while not actively inspecting network configuration otherwise.

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  • But I don't have Apple’s AirPort base station. I blocked SystemUIServer in the firewall and everything works fine. – Case39 May 11 at 21:41
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    @Case39 It doesn’t know that until it asks, using UDP on port 192. – grg May 11 at 21:49

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