Erik Hollembeak

Netcat Talks UDP

Netcat is something of a Swiss Army knife of a networking tool – it’s remarkably handy for doing things like creating minimal TCP clients and servers for development purposes. What I didn’t realize was that netcat can also communicate via UDP. To, for example, send a UDP message to a server listening for UDP traffic on port 3333, you could run:

$ echo "This is a UDP message" | nc -cu 3333

This will send “This is a UDP message” over UDP and include a CRLF line-ending. This has been particularly handy as a quick way to interact with UDP services.