Pure-Go library for cross-platform local peer discovery using UDP multicast 👩 🔁 👩
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examples add go.mod Sep 7, 2018
.gitignore Initial commit Apr 22, 2018
.travis.yml update go compatability Apr 24, 2018
Dockerfile Added and documented Docker-based test Feb 7, 2019
LICENSE Initial commit Apr 22, 2018
README.md add thanks Feb 7, 2019
go.mod update deps Feb 7, 2019
peerdiscovery.go Small refactorings regarding duplicasted code Feb 6, 2019
peerdiscovery_test.go Added IPv6 tests Feb 6, 2019



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Pure-go library for cross-platform thread-safe local peer discovery using UDP multicast. I needed to use peer discovery for croc and everything I tried had problems, so I made another one.


Make sure you have Go 1.5+.

go get -u github.com/schollz/peerdiscovery


The following is a code to find the first peer on the local network and print it out.

discoveries, _ := peerdiscovery.Discover(peerdiscovery.Settings{Limit: 1})
for _, d := range discoveries {
    fmt.Printf("discovered '%s'\n", d.Address)

Here's the output when running on two computers. (Run these gifs in sync by hitting Ctl + F5).

Computer 1:

computer 1

Computer 2:

computer 1

For more examples, see the scanning example or the docs.


To test the peer discovery with just one host, one can launch multiple containers. The provided Dockerfile will run the example code. Please make sure to enable Docker's IPv6 support if you are using IPv6 for peer discovery.

# Build the container, named peertest
$ docker build -t peertest .

# Execute the following command in multiple terminals
$ docker run -t --rm peertest
Scanning for 10 seconds to find LAN peers
 100% |████████████████████████████████████████|  [9s:0s]Found 1 other computers
0) '' with payload 'zqrecHipCO'


Pull requests are welcome. Feel free to...

  • Revise documentation
  • Add new features
  • Fix bugs
  • Suggest improvements


Thanks @geistesk for adding IPv6 support!