sandheepg/listening-ports.md

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Check for listening ports in Linux

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As a developer / administrator, its important to know which ports are listening on the server's network interfaces. They are important for a variety of reasons. To name a few,

To check if a port is already in use by a different application
To troubleshoot any issues
To detect any intrusion

To determine if a port is in use under an Unix-like system you can use lsof, netstat, nmap commands.

sudo lsof -i -P -n | grep LISTEN

sudo netstat -tulpn | grep LISTEN
netstat -anp tcp | grep LISTEN # for mac
netstat -anp udp | grep LISTEN # for mac

sudo nmap -sTU -O IP-address-Here

sandheepg/listening-ports.md

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