Netstat (Network Statistics)<\/strong> is a command-line utility used to monitor and troubleshoot network connections on Linux systems. It provides detailed information about active TCP\/UDP connections, listening ports, routing tables, network interfaces, and protocol statistics.<\/p>\n\n\n\n This quick reference guide covers some of the most commonly used Display all TCP and UDP ports currently listening, along with the process ID (PID) and program name.<\/p>\n\n\n\n Options:<\/strong><\/p>\n\n\n\n View the system’s routing table.<\/p>\n\n\n\n To prevent DNS lookups and display numeric addresses:<\/p>\n\n\n\n Find the process listening on a particular port.<\/p>\n\n\n\n Sample Output:<\/strong><\/p>\n\n\n\n This indicates that the Python process with PID Show active IPv4 TCP listening ports and the associated programs.<\/p>\n\n\n\n This command is useful for quickly auditing exposed TCP services on a server.<\/p>\n\n\n\n Display all active network connections and listening ports.<\/p>\n\n\n\n Show only listening sockets.<\/p>\n\n\n\n View TCP connections.<\/p>\n\n\n\n Display the process associated with each connection.<\/p>\n\n\n\n Note: Root privileges may be required to view all processes.<\/p>\n<\/blockquote>\n\n\n\n Refresh network statistics continuously in real time.<\/p>\n\n\n\n Press View listening TCP and UDP ports along with user and process details.<\/p>\n\n\n\n This command is particularly useful during security audits and troubleshooting sessions.<\/p>\n\n\n\n Display the kernel routing table using numeric IP addresses.<\/p>\n\n\n\n Although modern Linux distributions often recommend using the Keep this cheat sheet handy for quick network troubleshooting and server administration tasks.<\/p>\n\n\n\n While newer tools such as By keeping these commands handy, you can quickly diagnose connectivity problems, verify service availability, and maintain better visibility into your system’s network activity.<\/p>\n","protected":false},"excerpt":{"rendered":" Introduction Netstat (Network Statistics) is a command-line utility used to monitor and troubleshoot network connections on Linux systems. It provides detailed information about active TCP\/UDP connections, listening ports, routing tables, network interfaces, and protocol statistics. This quick reference guide covers some of the most commonly used netstat commands for system administrators and developers. View Listening ..<\/p>\nnetstat<\/code> commands for system administrators and developers.<\/p>\n\n\n\nView Listening Ports and Associated Processes<\/h2>\n\n\n\n
sudo netstat -lnptu<\/code><\/pre>\n\n\n\n\n
-l<\/code> : Show listening sockets<\/li>\n\n\n\n-n<\/code> : Display numerical addresses instead of resolving hostnames<\/li>\n\n\n\n-p<\/code> : Show PID and process name<\/li>\n\n\n\n-t<\/code> : Show TCP connections<\/li>\n\n\n\n-u<\/code> : Show UDP connections<\/li>\n<\/ul>\n\n\n\nDisplay the Routing Table<\/h2>\n\n\n\n
netstat -r<\/code><\/pre>\n\n\n\nnetstat -rn<\/code><\/pre>\n\n\n\nIdentify Which Process Is Using a Specific Port<\/h2>\n\n\n\n
netstat -pln | grep <port> | awk '{print $NF}'<\/code><\/pre>\n\n\n\nExample<\/h3>\n\n\n\n
netstat -pln | grep 8080 | awk '{print $NF}'<\/code><\/pre>\n\n\n\n1507\/python<\/code><\/pre>\n\n\n\n1507<\/code> is listening on port 8080<\/code>.<\/p>\n\n\n\nQuickly Display IPv4 TCP Listening Services<\/h2>\n\n\n\n
sudo netstat -vtlnp --listening -4<\/code><\/pre>\n\n\n\nList All Active Connections and Ports<\/h2>\n\n\n\n
netstat -a<\/code><\/pre>\n\n\n\nList All Listening Ports<\/h2>\n\n\n\n
netstat -l<\/code><\/pre>\n\n\n\nDisplay TCP Connections<\/h2>\n\n\n\n
netstat -t<\/code><\/pre>\n\n\n\nShow Process IDs and Program Names<\/h2>\n\n\n\n
netstat -p<\/code><\/pre>\n\n\n\n\n
Monitor Connections Continuously<\/h2>\n\n\n\n
netstat -c<\/code><\/pre>\n\n\n\nCtrl + C<\/code> to stop monitoring.<\/p>\n\n\n\nDisplay Listening TCP and UDP Ports with Process Information<\/h2>\n\n\n\n
sudo netstat -lepunt<\/code><\/pre>\n\n\n\nPrint the Routing Table<\/h2>\n\n\n\n
netstat -nr<\/code><\/pre>\n\n\n\nSummary<\/h2>\n\n\n\n
ss<\/code> command as a replacement, netstat<\/code> remains a valuable tool for network diagnostics and system administration. Understanding these commands can help you quickly identify open ports, troubleshoot connectivity issues, and monitor network activity on your servers.<\/p>\n\n\n\nCommonly Used Commands<\/h3>\n\n\n\n
Purpose<\/th> Command<\/th><\/tr> View listening ports and processes<\/td> sudo netstat -lnptu<\/code><\/td><\/tr>Show routing table<\/td> netstat -rn<\/code><\/td><\/tr>Find process using a port<\/td> netstat -pln | grep <port><\/code><\/td><\/tr>Show IPv4 TCP listeners<\/td> sudo netstat -vtlnp --listening -4<\/code><\/td><\/tr>List all connections<\/td> netstat -a<\/code><\/td><\/tr>List listening ports<\/td> netstat -l<\/code><\/td><\/tr>Show TCP connections<\/td> netstat -t<\/code><\/td><\/tr>Show process information<\/td> netstat -p<\/code><\/td><\/tr>Continuous monitoring<\/td> netstat -c<\/code><\/td><\/tr>Show listening TCP\/UDP ports<\/td> sudo netstat -lepunt<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\nConclusion<\/h2>\n\n\n\n
netstat<\/code> remains one of the most useful networking tools for Linux administrators, DevOps engineers, and developers. Whether you need to identify which service is listening on a port, inspect active connections, analyze routing tables, or troubleshoot network-related issues, netstat<\/code> provides valuable insights with simple commands.<\/p>\n\n\n\nss<\/code> offer improved performance and are gradually replacing netstat<\/code> on modern Linux distributions, understanding netstat<\/code> is still an essential skill because it is widely documented and commonly found in existing server environments.<\/p>\n\n\n\n