Need to Know Port Numbers

File Transfer Protocol (FTP)

20/21

Secure Shell (SSH)

22

Secure File Transfer Protocol (SFTP)

22

Telnet

23

Simple Mail Transfer Protocol (SMTP)

25

Domain Name System (DNS)

53

Dynamic Host Configuration Protocol (DHCP)

67/68

Trivial File Transfer Protocol (TFTP)

69

Hypertext Transfer Protocol (HTTP)

80

Post Office Protocol v3 (POP3)

110

Network Time Protocol (NTP)

123

Internet Message Access Protocol (IMAP)

143

Simple Network Management Protocol (SNMP)

161/162

Lightweight Directory Access Protocol (LDAP)

389

Hypertext Transfer Protocol Secure (HTTPS) [Secure Sockets Layer (SSL)] HTTPS [Transport Layer Security (TLS)]

443

Server Message Block (SMB)

445

Syslog

514

SMTP TLS

587

Lightweight Directory Access Protocol (over SSL) (LDAPS)

636

IMAP over SSL

993

POP3 over SSL

995

Structured Query Language (SQL) Server

1433

SQLnet

1521

MySQL

3306

Remote Desktop Protocol (RDP)

3389

Session Initiation Protocol (SIP)

5060/5061