netstat Examples

netstat is like a CCTV camera for your network. It shows which ports are open, which apps are listening, and who is connected.

✅ netstat Examples for Practice

1. Show all listening ports

netstat -tuln

• t → TCP connections
• u → UDP connections
• l → listening sockets
• n → numeric (IP/port instead of hostname)

👉 Practice: Check if SSH (22) and HTTP (80) are listening.

2. Show all connections (listening + established)

netstat -a

• Displays everything (listening + active connections).

3. Show which process is using a port

netstat -tulpn

• p → show process using the socket.

4. Show only TCP connections

netstat -tn

5. Show only UDP connections

netstat -un

6. Show routing table (like route -n)

netstat -rn

• Displays kernel routing table.
• Useful to check default gateway.

7. Show network statistics (sent/received packets)