important network ports into TCP and UDP
TCP Ports
| Port Number | Protocol | Description |
|---|
| 20, 21 | FTP | File Transfer Protocol (FTP) – used for file transfers |
| 22 | SSH | Secure Shell (SSH) – used for secure remote login |
| 23 | Telnet | Telnet – used for remote login (less secure than SSH) |
| 25 | SMTP | Simple Mail Transfer Protocol (SMTP) – used for email routing |
| 53 | DNS | Domain Name System (DNS) – used for resolving domain names |
| 80 | HTTP | HyperText Transfer Protocol (HTTP) – used for web traffic |
| 110 | POP3 | Post Office Protocol version 3 (POP3) – used for email retrieval |
| 119 | NNTP | Network News Transfer Protocol (NNTP) – used for Usenet articles |
| 143 | IMAP | Internet Message Access Protocol (IMAP) – used for email retrieval |
| 389 | LDAP | Lightweight Directory Access Protocol (LDAP) – used for directory services |
| 443 | HTTPS | HyperText Transfer Protocol Secure (HTTPS) – used for secure web traffic |
| 445 | SMB | Server Message Block (SMB) – used for file sharing |
| 465 | SMTPS | SMTP Secure (SMTPS) – used for secure email routing |
| 993 | IMAPS | IMAP Secure (IMAPS) – used for secure email retrieval |
| 995 | POP3S | POP3 Secure (POP3S) – used for secure email retrieval |
| 1433 | MSSQL | Microsoft SQL Server – used for database services |
| 1521 | Oracle | Oracle Database – used for database services |
| 3306 | MySQL | MySQL Database – used for database services |
| 3389 | RDP | Remote Desktop Protocol (RDP) – used for remote desktop access |
| 5432 | PostgreSQL | PostgreSQL Database – used for database services |
| 5900 | VNC | Virtual Network Computing (VNC) – used for remote desktop access |
| 8080 | HTTP-Alt | Alternative HTTP – used for web traffic when port 80 is unavailable |
| 8443 | HTTPS-Alt | Alternative HTTPS – used for secure web traffic when port 443 is unavailable |
TCP portsUDP Ports
| Port Number | Protocol | Description |
|---|
| 53 | DNS | Domain Name System (DNS) – used for resolving domain names |
| 67, 68 | DHCP | Dynamic Host Configuration Protocol (DHCP) – used for IP addressing |
| 123 | NTP | Network Time Protocol (NTP) – used for time synchronization |
| 161, 162 | SNMP | Simple Network Management Protocol (SNMP) – used for network management |
| 514 | Syslog | Syslog – used for system logging |
UDP ports
