Networking Commands

ss Linux Command

Modern replacement for netstat. Dumps socket statistics quickly.

What does ss do?

Modern replacement for netstat. Dumps socket statistics quickly.

ss [options]

ss -tulpn

How do I see all listening ports?

Use `ss -tlnp` to show all listening TCP ports with process names. The `-t` is TCP, `-l` is listening, `-n` is numeric, `-p` shows processes.

What does ss -tulpn show?

Shows all TCP and UDP listening sockets with numeric addresses and the process using each socket. This is the most common ss command.

How do I see all established connections?

Use `ss -tnp state established` to show only established TCP connections. This filters out listening and other states.

How do I see UDP connections with ss?

Use `ss -ulnp` to show all listening UDP sockets. The `-u` flag filters for UDP instead of TCP.

How do I see socket statistics summary?

Run `ss -s` to get a summary of socket statistics including total sockets, TCP, UDP, and other protocol counts.

How do I filter connections by port?

Use `ss -tn sport = :22` to filter by source port 22, or `ss -tn dport = :443` to filter by destination port 443.

How do I see connections to a specific IP?

Use `ss -tn dst 192.168.1.100` to filter connections to a specific destination IP address.

How do I see memory usage of sockets?

Use `ss -m` to display memory usage information for each socket, including send and receive buffer sizes.

Displays network connections, routing tables, interface statistics, and more.

Transfers data from or to a server using various protocols (HTTP, FTP, etc.).

Modern replacement for ifconfig. Shows and manipulates routing, devices, and tunnels.

Downloads files from the internet non-interactively via HTTP, HTTPS, or FTP.

Displays or configures network interface parameters (deprecated, use ip).

Performs DNS lookups and displays detailed name server query information.