Ports That used for Services

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January 24, 2020
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January 24, 2020
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Ports That used for Services

Ports That used for Services

The ports used for giving path to enter in the system. A port is an endpoint of communication. All the connections are (terminated)  at ports of hardware devices.A port number is always associated with an IP address of a host and the protocol type of the communication.It completes the destination or origination network address of a message. Specific port numbers are commonly reserved to identify specific services, so that an arriving packet can be easily forwarded to a running application. For this purpose, the lowest numbered 1024 port numbers identify the historically most commonly used services, and are called the well-known port numbers.

Common port numbers:-

The Internet Assigned Numbers Authority (IANA) is responsible for the global coordination of the DNS Root, IP addressing, and other Internet protocol resources. This includes the registration of commonly used port numbers for well-known Internet services.

The port numbers are divided into three ranges: the well-known ports, the registered ports, and the dynamic or private ports.

The well-known ports (also known as system ports) are those from 0 through 1023. The requirements for new assignments in this range are stricter than for other registrations.

Port Service name Transport protocol
 20, 21  File Transfer Protocol (FTP)  TCP
 22  Secure Shell (SSH)  TCP and UDP
 23  Telnet  TCP
 25  Simple Mail Transfer Protocol (SMTP)  TCP
 50, 51  IPSec  
 53  Domain Name Server (DNS)  TCP and UDP
 67, 68  Dynamic Host Configuration Protocol (DHCP)  UDP
 69  Trivial File Transfer Protocol (TFTP)  UDP
 80  HyperText Transfer Protocol (HTTP)  TCP
 110  Post Office Protocol (POP3)  TCP
 119  Network News Transport Protocol (NNTP)  TCP
 123  Network Time Protocol (NTP)  UDP
 135-139  NetBIOS  TCP and UDP
 143  Internet Message Access Protocol (IMAP4)  TCP and UDP
 161, 162  Simple Network Management Protocol (SNMP)  TCP and UDP
 389  Lightweight Directory Access Protocol  TCP and UDP
 443  HTTP with Secure Sockets Layer (SSL)  TCP and UDP

Use in URLs:- 

Port numbers are sometimes seen in web or other uniform resource locators (URLs). By default, HTTP uses port 80 and HTTPS uses port 443, but a URL like http://www.somethingexample.com:8080/path/ specifies that the web browser connects instead to port 8080 of the HTTP server.

(Note:- If you are using csf firewall , then you have to enter that port in csf.conf file . otherwise csf block your service . For more information about csf click here. )

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