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Discover what your phone does on the Internet.
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Device Observatory

The Device Observatory shows the activities of WiFi devices on a network on a local website. It is meant to raise the awareness for private data leaking from devices such as smartphones.

This also includes a package for OpenWrt. The package will create an WiFi Access Point for your phone to connect to. You can track your devices activity on a website on the router. External devices will only see their own data for privacy.

Pull Requests are welcome!



  • Devices accessing the info page only see own data (except for the local host)
  • Shows MAC address, DHCP device host name, device manufacturer
  • Shows accessed domains, IP addresses and ports
  • Shows first/last time a website was accessed
  • Show SSIDs from active scanning
  • Show traffic by destination


  • --dev device
    Device to parse war ethernet packets from.
    This option may occur multiple times.
    E.g. wlan0

  • --mdev device
    Device to parse raw wifi packets from.
    This option may occur multiple times.
    E.g. mon0

  • --mac-db file
    MAC to manufacturer database.
    E.g. macdb.txt
    Default: disabled

  • --port-db file
    File to map port numbers to human readable names.
    E.g. /etc/services
    Default: disabled

  • --json-output file
    Ouput all data as JSON file.
    Default: disabled

  • --device-timeout seconds
    Timeout device data after last ethernet activity.
    Default: never

  • --track-localhost [1|0]
    Track localhost as an device.
    Default: on

  • --webserver-port port
    Port of the build-in webserver. Set to 0 to disable webserver.
    Default: 8080

  • --webserver-path path
    Root folder for the build-in webserver. Usually not needed as all files are included into the binary.
    Default: internal

  • --help
    Show these options and help text.

Build On Linux Based Operating Systems

Install dependencies for compiling:

apt install libpcap-dev libmicrohttpd-dev vim-common
  • package libpcap-dev allows to capture pakets
  • package libmicrohttpd-dev is an embeddeable webserver
  • package vim-common contains the xxd tool

Get source code:

git clone
cd device-observatory



Start program:

./device-repository --dev eth0

Here, eth0 is an example interface. Normally you would create an Access Point WiFi interface (e.g. --dev wlan0) and an optional monitoring interface (e.g. --mdev mon0).

To see the data captured by the program, go to localhost:8080 or if the program runs your router.

Create WiFi Access Point


Create monitor mode interface

A monitor mode interface can be used to get all raw packets from the air on a specific channel. This is needed to detect SSIDs from scanning by phones/devices. Do iw dev to get a list of physical wireless devices.

iw phy phy0 interface add mon0 type monitor
ip link set dev mon0 up

On OpenWrt, this can also be done via the create_monitor setting in /etc/config/device-observatory. The mon0 device will be appended as --mdev mon0.

Build for OpenWrt

See the OpenWrt build instructions page.

Update macdb.txt

Console command to load the official database and create a stripped down database that is more usable:

curl | awk -F'[[:space:]]+' '/^[A-F0-9]{6}/{ printf("%s", $1); for(i=4; i < NF; i++) printf(" %s", $i); printf("\n"); }' > macdb.txt
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