🔌 Network Ports
Ports are logical channels that the TCP/IP suite uses for communication purposes
Specific processes/applications have dedicated ports from numbers 0-65535, however, the common ones are:
| Port | Tags | Protocol | Description |
|---|---|---|---|
| 21 - Control 20 - Data Transfer | FTP | TCP | File downloads |
| 22 | SSH | TCP | Encrypted data exchange |
| 23 | Telnet | TCP | Remote logging in for terminal servers |
| 25 | SMTP | TCP | Sending emails |
| 53 | DNS | UDP | Resolves host names to IP addresses |
| 67 | DHCP | UDP | Automatic IP addresses assignment |
| 80 | HTTP | TCP | Web traffic |
| 110 | POP3 | TCP | Receiving emails |
| 443 | HTTPS | TCP | Insecure internet traffic |
| 3389 | RDP | TCP | Remote access of clients |
When an IP Address is combined with a network port it is called a socket.
eg. 192.168.100.1:3389
Ports can be blocked by firewalls which will ultimately prevent devices using the ports designated process.