Port lookup
Port 22 — TCP
SSH
SSH (Secure Shell) gives a safe, coded way to sign in to another computer and run commands on it.
Why it matters
It is the usual way to manage servers from a distance, so a sign-in here that you do not know is worth a close look.
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Ports are daily work on the network desk.
Look up a port here, then see it in real work on the network desk.