Well-Known Ports

20

TCP - FTP (Data Transfer)

21

TCP - FTP (Control)

22

TCP - SSH (Secure Shell)

23

TCP - Telnet (Unencrypted Remote Login)

25

TCP - SMTP (Simple Mail Transfer Protocol)

53

TCP/UDP - DNS (Domain Name System)

67

UDP - DHCP (Server to Client)

68

UDP - DHCP (Client to Server)

69

UDP - TFTP (Trivial File Transfer Protocol)

80

TCP - HTTP (HyperText Transfer Protocol)

110

TCP - POP3 (Post Office Protocol v3)

119

TCP - NNTP (Network News Transfer Protocol)

123

UDP - NTP (Network Time Protocol)

137

UDP - NetBIOS Name Service

138

UDP - NetBIOS Datagram Service

139

TCP - NetBIOS Session Service

143

TCP - IMAP (Internet Message Access Protocol)

161

UDP - SNMP (Simple Network Management Protocol)

162

UDP - SNMP Trap

179

TCP - BGP (Border Gateway Protocol)

194

TCP - IRC (Internet Relay Chat)

443

TCP - HTTPS (HTTP Secure)

445

TCP - Microsoft-DS (SMB over TCP)

465

TCP - SMTPS (SMTP over SSL)

514

UDP - Syslog (System Logging)

546

UDP - DHCPv6 Client

547

UDP - DHCPv6 Server

587

TCP - SMTP (Email Submission)

993

TCP - IMAPS (IMAP over SSL)

995

TCP - POP3S (POP3 over SSL)

1433

TCP - Microsoft SQL Server

1434

UDP - Microsoft SQL Monitor

1521

TCP - Oracle Database

1723

TCP - PPTP (Point-to-Point Tunneling Protocol)

1812

UDP - RADIUS Authentication

1813

UDP - RADIUS Accounting

3306

TCP - MySQL Database

3389

TCP - RDP (Remote Desktop Protocol)

5060

UDP - SIP (Session Initiation Protocol - unencrypted)

5061

TCP - SIP (Session Initiation Protocol - encrypted)

5900

TCP - VNC (Virtual Network Computing)

8080

TCP - HTTP Alternate (Proxy, Web Servers)