nc

SafePort checks & raw sockets

nc -zv <host> <port>

-zv tests a single port; -l listens. The lightweight standard for connectivity checks.

Examples

nc -zv db01 5432Test DB port
nc -l 8080Listen on a port

Syntax

nc [-zv] [-l] <host> <port>

Before you run it

Close listeners when done.

Related commands

ssSockets and listening ports
telnetPlain TCP connection test
Test-NetConnectionPing + port reachability

The same reference, with no signal at all

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