Special Credit to Hamza Shah | LinkedIN
This is not an exhaustive list and should only serve as a gentle reminder
Web Services
| Port(s) | Protocol | Description |
|---|
| 80/443 | HTTP/HTTPS | Standard web traffic |
| 8000/8080/8443 | HTTP/HTTPS | Alternative web ports frequently seen |
File Transfer
| Port | Protocol | Description |
|---|
| 21 | FTP | File Transfer Protocol |
| 22 | SSH | Secure Shell |
| 445 | SMB | Server Message Block |
Directory Services
| Port | Protocol | Description |
|---|
| 389/636 | LDAP/LDAPS | Lightweight Directory Access Protocol |
| 88 | Kerberos | Network authentication protocol |
Database Services
| Port | Protocol | Description |
|---|
| 1433 | MS SQL | Microsoft SQL Server |
| 3306 | MySQL | MySQL Database |
| 5432 | PostgreSQL | PostgreSQL Database |
Email - Messaging
| Port | Protocol | Description |
|---|
| 25 | SMTP | Simple Mail Transfer Protocol |
| 110/995 | POP3/POP3S | Post Office Protocol (secure) |
| 143/993 | IMAP/IMAPS | Internet Message Access Protocol (secure) |
Management Protocols
| Port | Protocol | Description |
|---|
| 161/162 | SNMP | Simple Network Management Protocol (UDP) |
| 3389 | RDP | Remote Desktop Protocol |
| 5985/5986 | WinRM | Windows Remote Management |
Other Important Services
| Port | Protocol | Description |
|---|
| 53 | DNS | Domain Name System |
| 135 | MSRPC | Microsoft Remote Procedure Call |
| 139 | NetBIOS | Network Basic Input/Output System |
| 1080 | SOCKS | SOCKS Proxy |
| 23 | Telnet | Telnet Protocol |