- #HOW TO USE TELNET IN LINUX TO OPEN PORTS HOW TO#
- #HOW TO USE TELNET IN LINUX TO OPEN PORTS SOFTWARE#
161: Simple Network Management Protocol (SNMP).143: Internet Message Access Protocol (IMAP) client applications usually use it to retrieve digital email messages.
119: Network News Transfer Protocol (NNTP). 80: Hypertext Transfer Protocol (HTTP) used on the World Wide Web (www). 68: Dynamic Host Configuration Protocol (DHCP) client port. 67: Dynamic Host Configuration Protocol (DHCP) server port. 43: WHOIS protocol used for checking information about ownership of a domain name. 25: Simple Mail Transfer Protocol (SMTP) E-mail routing. 23: Telnet remote login service, unencrypted text messages that are insecure, and not recommended for most uses. 21: File Transfer Protocol (FTP) Command Control. 20: File Transfer Protocol (FTP) Data Transfer. This is an example of the few common port numbers: Knowing which ports are open on your network can be a crucial part and help you block malicious efforts directed at your system. 
Open ports can be evidence of intrusion on your network, so we should pay special attention to which ports they listening on your network.
49152-65535 – Dynamic ports are suggested for private use. 1024-49151 – Registered ports can be retained by sending a request to IANA (Internet-assigned numbers) and they are known by the term User Ports. They are recognized by the term System Ports. 0-1023 – are “Well Known Ports” related to services that are considered critical or substantial. There are different categories of ports (System Ports, User Ports, and Private Ports) and they are defined by a number in the range from 0 to 65535.īelow are explained the different categories of ports: Transmission Control Protocol (TCP), as well as the User Datagram Protocol (UDP), are the most commonly used protocols using ports. #HOW TO USE TELNET IN LINUX TO OPEN PORTS SOFTWARE#
In software terms, and more definitely in computer networking, a port is an available network location implemented in an operating system to assist differentiate traffic destined for various services or applications.
#HOW TO USE TELNET IN LINUX TO OPEN PORTS HOW TO#
In this article, we will talk about how to find out a list of all open ports in Linux but before that, we will mention about ports in computer networking.
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