Inspect Sockets With ss

Show listening TCP/UDP ports and connection states without netstat.

LinuxnetworksocketsDiagnosticsLow risk

Run ss -tuln to list listening TCP and UDP sockets numerically.

01Command

Command

$ ss -tuln

02What it does

ss reads kernel socket tables directly and is much faster than the deprecated netstat, especially with many connections. Combined with -p it names the owning process, which is essential for remote server troubleshooting.

03Risk

RiskLow risk

Requirementssudo apt install iproute2

!Warning: The -p option reveals process information and usually needs root; use it only where appropriate.

04Undo

✓No undo needed — this command does not change persistent state.

05Sources

ss.8.en.html manual page (Debian bookworm)
Debian · technical · 2026-09-20
Evidence: Documents ss and its TCP/UDP/listening/numeric options.

Last verified: 2026-10-13 · Category: Network

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