Cheat Sheet logoCheat Sheet Today
Linux Networking Cheat Sheet/Test TCP connectivity

Check whether a remote TCP port is reachable.

Back to sheetBrowse commands
Sign in to save
Section: Sockets and Connections

Test TCP connectivity

bash
bash
nc -vz example.com 443
Explanation

Check whether a remote TCP port is reachable.

View in sheet →

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Compare commandsView fixes

Related commands

Same sheet · prioritizing Sockets and Connections
Show listening TCP sockets
List listening TCP sockets with names.
OpenIn sheetbashsame section
Show established connections
Display established TCP sessions.
OpenIn sheetbashsame section
Listen on a TCP port
Open a simple TCP listener for testing.
OpenIn sheetbashsame section
Show listening UDP sockets
List listening UDP sockets with names.
OpenIn sheetbashsame section
Filter sockets by port
Find sockets using a specific local port.
OpenIn sheetbashsame section
Show process using port
Find which process owns a TCP port.
OpenIn sheetbashsame section