Free Mac OS X WiFi Scanner for Snow Leopard and Lion

Download WiFi Scanner for Mac OS

Free Mac OS X Wifi Scanner for Snow Leopard and Lion

WiFi Scanner is a free 802.11 wireless scanner and connection manager for Mac OS X 10.6 Snow Leopard or later. This will detect access points and clients in ad-hoc mode if the SSID is being broadcasted. It can be used for wireless site surveys, wireless discovery, and to connect to wifi networks. The tool reports signal strength in dBm and shows access point BSSID/MAC addresses.

WiFi Scanner v1.0 Screenshots

WiFi Scanner v1.0 has the two main screens shown below.

wifi scanner scan results

wifi scanner interface info

wifi scanner about version

WiFi Scanner User Guide

Interface Popup Button

The app supports a multiple interface scenario, whereby the machine could have several IEEE 802.11 wireless interfaces. The popup button on the top left corner of the app allows the user to select which interface should be set as the current interface. By default, the popup button will select the primary WLAN interface for the system.

Refresh Button

In the top right corner of the app, there is a push button entitled “Refresh”. This button provides different functionality depending on which tab is currently selected. If the Interface Info or Configuration tabs are selected, the button will refresh the information display in the currently selected tab. If the Scan tab is selected, the button will start a broadcast scan and block until the scan has completed.

Interface Info Tab

The tab entitled “Interface Info” contains information describing the static and dynamic state of the currently selected interface. Additionally, it allows the user to toggle interface power, disconnect from the current network, and change channels.

You will notice that you will not be able to change channels while connected to a network–this is by design. Attempting to do this would return a error. Furthermore, you will notice that when the interface is powered OFF, all the dynamic status information is cleared.

Scan Tab

The tab entitled “Scan” allows the user to scan for networks using the current interface. The scan results are shown in the table view and are automatically ordered by network name. For each network, there is several pieces of information displayed in the table row that describe that particular network.

There is a button in the checkbox left corner of the Scan tab which sets/unsets the parameter to merge the scan result with the same SSID.

And, there is a button in the bottom right corner of the Scan tab which allows the user to join the currently selected network in the table. A sheet will be presented upon clicking the Join button that will allow the user to provide the appropriate credentials for the given network.

WiFi Scanner Download

Download WiFi Scanner for Mac OS

wifi scanner installer

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Filed under: WLAN Site Survey, WLAN Tools

6 Responses to “Free Mac OS X WiFi Scanner for Snow Leopard and Lion”

  1. I noticed in the first screen shot above that TX Power is listed as 1496 mW. I assume this is in error since I would imagine that the wireless adapter in the Mac is going to max out at 100 mW at best. Correct?

  2. Thanks a lot for this tool. I’ve been looking for a replacement to iStumber ever since it stopped working when Snow Leopard came out. I’m glad I was able to find your tool here. Have you ever considered listing this on MacUpdate or Versiontracker to make it easier for people to find? Thanks again for the great program.

  3. This is a really great tool and nicely done! Thanks so much for creating it and releasing it.

    One small piece of feedback: I’m using the tool to do a site survey to figure out what channels I want to use on my base stations. If I could sort the table of scan results (by clicking on the column headers), it would make this task much easier.

    Thanks again,


  4. Already in next version. Testing it now

  5. […] WiFi Scanner […]

  6. Really great tool. Only thing that bugs me a little is, when refreshing my results, the sorting columns seems to revert back to the SSID.