Take a quiz and find out if you know the most popular ports. Also included the list of popular port numbers.

Port quiz

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Port list and numbers

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FTP – 21 TCP (control) File Transfer Protocol – FTP is one of the most commonly used file transfer protocols on the Internet and within private networks.
SSH – 22 TCP/UDP Secure Shell – SSH is the primary method used to manage network devices securely at the command level. 
Telnet – 23 TCP/UDP Telnet is the primary method used to manage network devices at the command level.
SMTP – 25 TCP Simple Mail Transfer Protocol
POP3 – 110 TCP Post Office Protocol – POP version 3 is one of the two main protocols used to retrieve mail from a server. 
IMAP – 143 TCP Internet Message Access Protocol – IMAP version3 is the second of the main protocols used to retrieve mail from a server. 
NTP – 123 UDP Network Time Protocol – One of the most overlooked protocols is NTP. NTP is used to synchronize the devices on the Internet.
DNS – 53 TCP/UDP Domain Name System
HTTP – 80 TCP Hypertext Transfer Protocol – HTTP is one of the most commonly used protocols on most networks.
HTTPS – 443 TCP Hypertext Transfer Protocol Secure
SNMP – 161 UDP Simple Network Management Protocol
MS SQL – 1433 TCP Microsoft SQL
RDP – 3389 Remote Desktop Port
DHCP – 67/68 UDP 67 (IPv4 client) and UDP 68 (IPv4 server) Dynamic Host Configuration Protocol
TFTP – 69 UDP Trivial File Transfer Protocol
SSL – 443TCP Secure Sockets Layer
RIP – 520 UDP Routing Information Protocol
NetBIOS – 137/138/139 TCP/UDP – NetBIOS itself is not a protocol but is typically used in combination with IP with the NetBIOS over TCP/IP (NBT) protocol.

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