Port Numbers

20

File Transfer Protocol (FTP) data transfer

21

File Transfer Protocol (FTP) control commands

22

Secure Shell (SSH) and its extensions Secure File Transfer Protocol (SFTP) and Secure Copy Protocol (SCP)

23

Telnet

53

Domain Name System (DNS)

67

Dynamic Host Configuration Protocol (DHCP) server

68

Dynamic Host Configuration Protocol (DHCP) client

69

Trivial File Transfer Protocol (TFTP)

80

Hypertext Transfer Protocol (HTTP)

443

Hypertext Transfer Protocol Secure (HTTPS) using Transport Layer Security (TLS)

25

Simple Mail Transfer Protocol (SMTP)

587

Simple Mail Transfer Protocol (SMTP) over Transport Layer Security (TLS) (SMTPS)

110

Post Office Protocol v3 (POP3)

995

Post Office Protocol v3 (POP3) over Secure Sockets Layer (SSL)

143

Internet Message Access Protocol (IMAP)

993

Internet Message Access Protocol (IMAP) over Secure Sockets Layer (SSL)

123

Network Time Protocol (NTP)

161

Simple Network Management Protocol (SNMP) on management station

162

Simple Network Management Protocol (SNMP) on devices

389

Lightweight Directory Access Protocol (LDAP)

636

Lightweight Directory Access Protocol (LDAP) over Secure Sockets Layer (SSL)

445

Server Message Block (SMB)

514

Syslog

1433

Structured Query Language (SQL) Server

3389

Remote Desktop Protocol (RDP)

5060

Session Initiation Protocol (SIP)

5061

Session Initiation Protocol (SIP) over Transport Layer Security (TLS)