Objective 1.2: Common Ports


Objective 1.2: Identify commonly used TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) default ports

See Objective 1.1: Common Protocols for information on the protocols that communicate using these ports.

TCP (Transmission Control Protocol) ports

Port Protocol
20 FTP (File Transfer Protocol)
21 FTP (File Transfer Protocol)
22 SSH (Secure Shell)
23 Telnet
25 SMTP (Simple Mail Transfer Protocol)
53 DNS (Domain Name System)
80 HTTP (Hypertext Transfer Protocol)
110 POP3 (Post Office Protocol version 3)
123 NTP (Network Time Protocol)
143 IMAP4 (Internet Message Access Protocol version 4)
443 HTTPS (Hypertext Transfer Protocol Secure)
3389 RDP (Remote Desktop Protocol)

UDP (User Datagram Protocol) ports

Port Protocol
53 DNS (Domain Name System)
67 BOOTP/DHCP (Bootstrap Protocol/Dynamic Host Configuration Protocol)
69 TFTP (Trivial File Transfer Protocol)
161 SNMP (Simple Network Management Protocol)
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