How to check whether a particular port is open or not?

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How to check whether a particular port is open or not?..

Answer / guest

netstat -an |grep -i <port number>

Is This Answer Correct ?    26 Yes 2 No

How to check whether a particular port is open or not?..

Answer / rahul

check in /etc/services file for any enabled ports also

Is This Answer Correct ?    6 Yes 5 No

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