Bash Prompt · Dec 12, 2023

How to Quickly Check If A Port Is Open With netcat

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Sometimes you need to check if a port is open and available e.g. not firewalled, from your current location. 
 The following netcat command will instantly tell you if you a port is open and you can connect to it on a remove server: 
 netcat -w1 -z -v <HOST> <PORT>
 E.g.: 
 netcat -w1 -z -v bash-prompt.net 443
 If the port is open you’ll get the following response: 
 $…

Sometimes you need to check if a port is open and available e.g. not firewalled, from your current location.

The following netcat command will instantly tell you if you a port is open and you can connect to it on a remove server:

netcat -w1 -z -v <HOST> <PORT>

E.g.:

netcat -w1 -z -v bash-prompt.net 443

If the port is open you’ll get the following response:

$ netcat -w1 -z -v bash-prompt.net 443
bash-prompt.net [5.161.150.90] 443 (https) open

And if it’s closed:

Read on bash-prompt.net ↗

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