What are the protocols used by port numbers?
Subscribe to our newsletter.Stay on top of the latest thoughts, strategies and insights from enterprising peers. Show Here are some of the most often-encountered network ports and their associated services. The physical ports on your computer allow communicate with peripheral devices such as your keyboard and mouse and to connect
with internet devices via Ethernet cables. Witin computer networking, ports serve a similar purpose. When a computer system seeks to connect to another computer, the port serves as a communication endpoint. It is also possible for different services running on the same computer to expose various ports and communicate with one another using these ports. In simple terms, if a software application or service needs to communicate with others, it will expose a port. Ports are
identified with positive 16-bit unsigned integers, ranging from 0 to 65535. Other services use this port number to communicate with the service or app. Port numbers are divided into three ranges: well-known ports, registered ports, and dynamic or private ports. Well-known ports (also known as system ports) are numbered from 0 through 1023. For example,
to connect to the host example.com via SSH, I would use this command: In this example, -v stands for verbose, and you should see output similar to this: As shown, SSH is trying to connect to example.com using port number 22. You may use the -p option to specify another port number; otherwise, SSH will default to 22. The
Internet Assigned Numbers Authority (IANA) has assigned port numbers to commonly used services like SSH, FTP, HTTP, HTTPS, and others. Here are some of the most common ones: Port Number Usage 20 File Transfer Protocol (FTP) Data Transfer 21 File Transfer Protocol (FTP) Command Control 22 Secure Shell (SSH) 23 Telnet - Remote login service, unencrypted text messages 25 Simple Mail Transfer Protocol (SMTP) E-mail Routing 53 Domain Name System (DNS) service 80 Hypertext Transfer Protocol (HTTP) used in World Wide Web 110 Post Office Protocol (POP3) used by e-mail clients to retrieve e-mail from a server 119 Network News Transfer Protocol (NNTP) 123 Network Time Protocol (NTP) 143 Internet Message Access Protocol (IMAP) Management of Digital Mail 161 Simple Network Management Protocol (SNMP) 194 Internet Relay Chat (IRC) 443 HTTP Secure (HTTPS) HTTP over TLS/SSL In my work, I most commonly come across ports 80, 443, 20, 21, 22, 23, 25, and 53. Knowing these ports can help you work more efficiently. What ports do you use the most, and why?
Kedar is a Software Quality Engineer at Red Hat working with CloudForms(upstream ManageIQ) project and primarily looking at deployment/management of our internal infrastructure. Interested in Jenkins Pipeline and Ansible for automating deployments. Also writing Shinken modules for Monitoring and Alerting. Related Content
What is port numbers for protocols?A port number is always associated with an IP address of a host and the type of transport protocol used for communication. It completes the destination or origination network address of a message.
What are the 4 types of protocol?Transmission Control Protocol (TCP) Internet Protocol (IP) User Datagram Protocol (UDP) Post office Protocol (POP)
What are the 3 types of port numbers?The port numbers are divided into three ranges:. Well-known ports. The well known ports are those from 0 - 1,023. ... . Registered ports. The registered ports are those from 1,024 - 49,151. ... . Dynamic and/or private ports. The dynamic and/or private ports are those from 49,152 - 65,535.. What is the protocol for port 21?Port numbers 21 and 20 are used for FTP. Port 21 is used to establish the connection between the 2 computers (or hosts) and port 20 to transfer data (via the Data channel).
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