Port numbers-FTP, TELNET, HTTP, SMTP, POP3, IMAP, BIOS, SSH, DHCP
This page describes well known port numbers defined in RFC 1700.It mentions Port numbers for FTP, TELNET, HTTP, SMTP, POP3, IMAP, BIOS, SSH, DHCP used in TCP, UDP and IP protocols.
Port Numbers: The end point of a logical connection is known as port. It is a 16 bit size number ranging from 0 to 65536. The port numbers from 0 to 1024 are known as well known ports and are used for specialized services or privileged services. For example as mentioned in the table below port 80 is used for HTTP while ftp port number is 21 etc.
Table of Port numbers used for FTP, TELNET, HTTP, SMTP, POP3, IMAP, BIOS, SSH, DHCP protocols
Port numbers are pre-assigned by IANA (Internet Assigned Numbers Authority). They are specified in RFC 1700. Following table mentions port numbers for FTP, TELNET, HTTP, SMTP, POP3, IMAP, BIOS, SSH, DHCP protocols. These protocols are used in TCP or UDP connections in computer networks.
| Port Number | Protocol description |
|---|---|
| 20, 21 | port number 20 is used for FTP data while port number 21 is used for FTP Control |
| 23 | Used for TELNET |
| 80, 8080 | HTTP |
| 443 | HTTPS |
| 161 | SMTP (Simple Mail Transfer Protocol) |
| 110 | POP3 |
| 143 | IMAP i.e. Interim Mail Access Protocol |
| 137, 138, 139 | port number 137 is used for BIOS Name service, 138 for NetBIOS-dgm, 139 for NetBIOS Datagram service |
| 22 | Used for SSH remote login protocol, SSH is short form of Secure Shell |
| 67, 68 | The port number 68 is used for DHCP client and 67 is used for DHCP server |
| 53 | DNS (Domain Name System) |
| 69 | TFTP (Trivial File Transfer Protocol) |
| 70 | Gopher services |
| 79 | Finger |
| 161 | SNMP |
| 179 | BGP (Border Gateway Protocol) |
| 389 | LDAP (Lightweight Directory Access Protocol) |
| 5800, 5900 | VNC |
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