TCP UDP PORT-In the TCP / IP network protocol, a port is a mechanism that allows a computer to support several connection sessions with other computers and programs on the network. The port can identify applications and services that use connections in the TCP / IP network. So, the port also identifies a particular process in which a server can provide a service to the client or how a client can access a service that is on the server. The port can be identified by the number 16-Bit (two bytes), which is called Port Number and is classified by what type of transport protocol is used, into the TCP Port and UDP Port. Because it has a 16-bit number, the maximum number of ports for each transport protocol used is 65536.

Judging from the numbering, UDP and TCP ports are divided into three types, namely as follows:

  • Well-known Port: which initially ranges from 0 to 255 but then widened to support between 0 to 1023. Port numbers included in well-known ports, always represent the same network services, and are set by the Internet Assigned Number Authority ( IANA). Some of the ports that are in the range Well-known ports are still not defined and are used for services that will exist in the future. Well-known ports are defined in RFC 1060.
  • Registered Port: These are ports that are used by computer vendors or different networks to support the applications and operating systems they make. Registered ports are also known and registered by the IANA but are not permanently allocated, so other vendors can use the same port number. The registered port range ranges from 1024 to 49151 and some of the ports include Dynamically Assigned Port.
  • Dynamically Assigned Port: is the ports specified by the operating system or applications that are used to serve requests from users according to needs. Dynamically Assigned Ports range from 1024 to 65536 and can be used or released as needed. tcp udp port

Here Are Some Examples Of Welknown That Often We Use Ports Along With The Functions Of The tcp udp port:

Type Port
File Transfer protocol port
File Transfer protocol <control> and connection dialog port
Simple Mail Transfer Protocol 
Domain Name System Server
DHCP/BOOTP Protocol Server
DHCP/BOOTP Protocol Server
Trivial File Transfer Protocol
World Wide Web HTTP
Network Time Protocol
Interactive Mail Access Protocol version 3

Here is the understanding of the names of the tcp udp port uses

  • FTP (short for File Transfer Protocol) is an Internet protocol that runs within the application layer which is the standard for transferring computer files between machines in an internetwork
  • SMTP (Simple Mail Transfer Protocol) is one of the protocols commonly used for sending electronic mail on the Internet. This protocol is used to send data from an e-mail sending computer to the recipient's electronic mail server.
  • HTTP (Hypertext Transfer Protocol, more commonly seen as http) is a protocol used to transfer documents on the World Wide Web (WWW). This protocol is a lightweight, non-status and generic protocol that can be used in various types of documents.
  • POP3 (Post Office Protocol version 3) is a protocol used to retrieve e-mail (e-mail) from an e-mail server.
  • IMAP (Internet Message Access Protocol) is a standard protocol for accessing / retrieving e-mail from servers. IMAP allows users to choose e-mail messages that they will take, create folders on the server, search for certain e-mail messages, even delete existing e-mail messages.

Understanding tcp udp port and tcp udp port functions

A port is a socket or connection jack located outside the system unit where different cables are plugged in. Each port must have different physical functions and forms. These ports are serial ports, parallel ports, SCSI ports (read "scuzzy"), USB ports. During this time we usually use these ports to transmit data. tcp udp port

  • Serial ports are used to transmit data remotely slowly, such as keyboards, mice, monitors, and dial-up modems.
  • Parallel ports to transmit data over short distances quickly. This port is often used to connect printers, external disks, or magnetic tape for reading.
  • • SCSI port (small computer system interface), to transmit data quickly at can even be used for 7 devices at once or "daisy chain". Example of daisy chain: from SCSI controller then connected to an external hard drive drive device, from an external HDD connected serially to another device such as a tape drive, then from that tape drive it can also be connected to a CD / DVD drive and so on.
  • USB (universal serial bus) port, for transmitting data up to 127 peripherals in a daisy chain.
  • Special additional ports such as: FireWire, MIDI, IrDa, Bluetooth, and Ethernet. Fire Wire works for camcorders, DVD players and TVs. While port MIDI (musical instrument digital interface) to connect musical instruments. Then the IrDA (Infrared Data Association) port for wireless connections is a few feet. The Bluetooth port is a short distance radio wave that can transmit 9 m. Ethernet port is for LAN. tcp udp port
In computer network terminology, ports are specific communication points used by an application that utilizes the transport layer on TCP / IP technology. This article tells about several ports that are used by applications or standard protocols.

In computer terminology there are two types of tcp udp port, namely:

  • Physical Port, is a socket / slot / plug that is behind the CPU as a connector for computer input-output equipment, for example PS2 Port used by Mouse and Keyboard, USB Port or Parallel Port.
  • Logic ports (non physical), are ports that are used by applications as a path to connect with other computers through TCP / IP technology, of course, including internet connections.
What will be discussed in this article is port logic, it might be useful for those of you who manage Linux servers for various purposes.

Standard and Use tcp udp port:

  • 1-19, various protocols, some of these ports are not really needed but cannot be bothered. Examples of echo services (port 7) that should not be confused with general ping programs.
  • 20 –FTP-DATA. (Active) Default FTP connection uses two ports,port 21 is the control port, and port 20 is where the data is entered. tcp udp port
  • 21 – Default Port FTP server port used by File Transfer Protocol. When someone accesses the FTP server, the FTP client by default connects via port 21.
  • 22 - SSH (Secure Shell), this port is the default port for SSH, usually changed by the server manager for security reasons.
  • 23 - Telnet server. If you run a telnet server, this port is used by the telnet client for connections with the telnet server.
  • 25 - SMTP, Simple Mail Transfer Protocol, or mail server port, is the standard port used in e-mail communication between fellow SMTP Servers.
  • 37 - Time Service, built-in port for time services.
  • 53 - DNS, Domain Name Server port Default. Name Server uses this port, and answers questions related to translating domain names to IP Address.
  • 67 (UDP) - BOOTP, or DHCP default port <server>. The need for Dynamic Addressing is done through this port. tcp udp port
  • 68 (UDP) – Default Port BOOTP, or DHCP port used by the client.
  • 69 - tftp, or Trivial File Transfer Protocol.
  • 79 - Finger Port, used to provide information about the system, and user logins.
  • 80 - WWW or HTTP port web server. The most commonly used ports on the Internet.
  • 81 - Port Web Server Alternative, when port 80 is blocked, port 81 can be used as an alternative port to service HTTP.
  • 98 - Administrative Port access web Linuxconf port.
  • 110 - POP3 Port, aka Post Office Protocol, port of the pop mail server. If you retrieve e-mail stored on the server, you can use POP3 technology that runs on this port.
  • 111 – Default Port Is 111 sunrpc (Sun Remote Procedure Call) or portmapper port. Used by NFS (Network File System), NIS (Network Information Service), and various related services.
  • 113 - identd or server auth port. Sometimes it's needed, by some old form services (like SMTP and IRC) to validate connections.
  • 119 - NNTP or Port used by News Server, it is very rarely used.
  • 123 - Network Time Protocol (NTP), a port used to synchronize with a time server where a high level of accuracy is needed.
  • 137-139 - NetBIOS (SMB).
  • 143 - IMAP, Interim Mail Access Protocol. It is an application that allows us to read e-mail that is on the server from a computer in our home / office, this protocol is slightly different from POP.
  • 161 - SNMP, Simple Network Management Protocol. More commonly used in routers and switches to monitor statistics and vital signs (monitoring needs).
  • 177 – Default Port XDMCP, X Display Management Control Protocol for remote connections to an X server is port 177.
  • 443 - HTTPS, secure HTTP (WWW) protocols are used quite wide.
  • 465 - SMTP over SSL, email server protocol
  • 512 (TCP) - exec is how to show on netstat. Actually the right name is Rexec, for Remote Execution.
  • 512 (UDP) - biff, protocol for k mail notification.
  • 513 - default port to Login, actually rlogin and aka Remote Login. It has nothing to do with the standard / bin / login that we use every time we log in. tcp udp port
  • 514 (TCP) - Shell is a nickname, and how netstat shows that. Actually, rsh is an application for "Remote Shell". Like all "r" commands this throws back to the kindler, very smooth.
  • 514 (UDP) - The syslog port daemon, only used for remote logging purposes.
  • 515 - lp or print server port.
  • 587 - MSA, Mail Submission Agent. A new mail handling protocol is supported by most MTA's (Mail Transfer Agent).
  • 631 - CUPS (Daemon for printing purposes), a port that serves web-based service management.
  • 635 - Mountd, part of NFS. tcp udp port
  • 901 - SWAT, Samba Web Administration Tool port. The port used by web-based SAMBA management applications.
  • 993 - IMAP via SSL.
  • 995 - POP via SSL.
  • 1024 - This is the first port that is an Unprivileged port, which is dynamically assigned to the kernel for any application that requests it. Default port 1024 and Other applications generally use unprivileged ports above port 1024.
  • 1080 - Socks Proxy Server.
  • 1433 - MS SQL Port server.
  • 2049 - NFSd dan  Network File Service Daemon default port.
  • 2082 - cPanel port, this port is used for web-based management applications provided by cpanel.
  • 2095 - This port is used for the cpanel webmail application.
  • 2086 - This port is used for WHM, or cpanel's Web Host Manager.
  • 3128 - Squid Proxy server port.
  • 3306 - MySQL server port.
  • 5432 - PostgreSQL server port.
  • 6000 - X11 TCP port for remote. It includes ports 6000-6009 because X can support various displays and each display will have its own port. SSH X11 Forwarding will start using ports at 6,010.
  • 6346 - Gnutella.
  • 6667 - ircd, Internet Relay Chat Daemon.
  • 6699 - Napster.
  • 7100-7101 - Some Font servers use that port.
  • 8000 and 8080 - Common Web Cache and Web Proxy server ports.
  • 10000 - Webmin, the port used by webmin in web-based management services. tcp udp port
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