Standard port commonly used in the network
The following is an explanation of the ports and their functions.
Understanding ports and port functions
A port is a socket or gate used for connection (connector), which is located outside the system unit as a place for different cables to be plugged in. Each port must have a different function and physical form. The ports are: serial port, parallel port, SCSI port (pronounced “scuzzy”), USB port. So far, we usually use these ports to transmit data.
Most of these ports are unnecessary but cannot be avoided. For example, the echo service (port 7), which should not be confused with common ping programs,
FTP-DATA. “Active” FTP connections use two ports: 21 (the control port), and 20 (where data comes in). Passive FTP doesn’t use port 20 at all.
The FTP server port is used by the File Transfer Protocol. When someone accesses the FTP server, the FTP client will by default connect via port 21.
SSH Secure Shell This port is used for the SSH port, SSH (Secure Shell). This port is the standard port for SSH, usually changed by the server manager for security reasons.
Telnet If you are running a telnet server, then this port is used by the telnet client to connect to the telnet server.
SMTP, Simple Mail Transfer Protocol, or mail server port, is the standard port used in sending email communications between SMTP servers.
time service, and a built-in port for time service.
DNS, or Domain Name Server port. Name Servers use this port and answer questions related to translating domain names to IP addresses.
Port 67 (UDP),
BOOTP, or DHCP port (server). The need for Dynamic Addressing is fulfilled through this port.
Port 68 (UDP),
BOOTP, or DHCP port used by the client,
tftp, or Trivial File Transfer Protocol.
finger port, used to provide information about the system and allow user login.
the WWW or HTTP port of the web server. The most commonly used ports on the Internet are
Alternative Web Server Port: When port 80 is blocked, then port 81 can be used as an alternative port to serve HTTP.
Web access administration port on Linuxconf
POP3 (Post Office Protocol) port, also known as pop mail server port.If you retrieve email stored on the server, you can use POP3 technology that runs on this port.
Sunrpc (Sun Remote Procedure Call) or portmapper port. It is used by NFS (Network File System), NIS (Network Information Service), and various related services.
identd or auth port server. It is sometimes required by some older forms of services (such as SMTP and IRC) to perform connection validation.
NNTP, or the port used by the news server, is very rarely used.
A high degree of accuracy is required for synchronization with time servers via Network Time Protocol (NTP).
IMAP, or Interim Mail Access Protocol, is an application that allows us to read e-mail that is on the server from a computer in our home or office. This protocol is slightly different from POP.
SNMP, or Simple Network Management Protocol, It is more commonly used in routers and switches to monitor statistics and vital signs for monitoring purposes.
XDMCP, X Display Management Control Protocol, Remote Connection to an X Server for
LDAP Server LDAP, or Lightweight Directory Access Protocol, is becoming popular for directory access, or name, phone, and address directory. For example, LDAP ://LDAP.Bigfoot.Com is an LDAP directory server.
The HTTPS, secure HTTP (WWW) protocol in use is quite wide. Secure Sockets Layer (SSL) Server When you run a secure server, SSL clients wanting to connect to your secure
The server will connect on port 443. This port needs to be open to run your own Secure Transaction server.
SMB over IP, File Sharing Weaknesses of Windows that open this port This port is typically used for file sharing, including printer sharing, and it is easy for viruses and worms to enter.
SMTP over SSL, email server protocol
Port 512 , TCP/IP
(TCP)exec is how it shows in netstat. Actually, the proper name is rexec, for Remote Execution.
Port 512, UDP
(UDP) biff, the protocol for notification mail.
Login, actually rlogin, aka Remote Login. It has nothing to do with the standard /bin/login that we use every time we log in.
Port 514 (TCP),
Shell is a nickname, and how netstat shows it Actually, rsh is an application for “Remote Shell”. Like all “r” commands, this throws back to Kindler, very subtle.
Port 514 (UDP),
The syslog daemon is used only for remote logging purposes.
or print the server port.
MSA, or Mail Submission Agent, A new mail handling protocol is supported by most MTAs (Mail Transfer Agents).
CUPS (Daemon for printing purposes), a port that serves web-based service management.
Mountd, part of NFS.
SWAT, Samba Web Administration Tool port. The port is used by web-based SAMBA management applications.
IMAP over SSL.
POP over SSL.
This is the first port, which is the unprivileged port, dynamically assigned by the kernel to any application that requests it. Other applications generally use unprivileged ports over port 1024.
Socks Proxy Server.
MS SQL Server Ports.
Ports 1503, 1720
Microsoft NetMeeting and VOIP MS NetMeeting and other VOIP allow you to host Internet calls or videoconferences with up to 16 NetMeeting or VOIP users. Other
port of 2049,
NFSd, Network File Service Daemon port.
This port is used for web-based management applications provided by cPanel.
port of 2095,
This port is used for the cPanel webmail application.
This port is used for WHM, or Control Panel Web Host Manager.
There is an active alternative port from TZO to service email forwarding. This port is not a standard port but can be used if the SMTP port is blocked.
Squid Proxy server port.
MySQL server ports.
PostgreSQL server port.
Port 3389: Remote Desktop In Windows XP, this port is used for remote desktop.
PCAnywhere When a PCAnywhere server is set up to receive remote requests, it listens on TCP port 5631. This allows you to run a PCAnywhere host and use the Internet to connect back and remotely control your PC.
Virtual Network Computing (VNC) When you run a VNC server to remotely control your PC, it uses port 5900. VNC is useful if you want to remotely control your server.
X11 TCP port for remotes. This includes ports 6000–6009, as X can support multiple displays and each display will have its own port. SSH X11Forwarding will start using the port at 6.010.
ircd, Internet Relay Chat Daemon.
Some font servers use that port.
Ports 8000 and 8080, respectively.
Common Web Cache and Web Proxy server ports
Mikrotik Winbox port, which is useful for Remote Setting Mikrotik both locally and on the Internet.
Webmin, the port used by webmin in web-based management services
And there are many more ports that are used for various purposes. Of course, all ports always go hand in hand with IP so that the port can be accessed.
FTP (short for File Transfer Protocol) is an Internet protocol that runs in the application layer and is a standard for transferring computer files between machines in an internetwork.
b. SMTP (Simple Mail Transfer Protocol) is one of the protocols commonly used for sending electronic mail on the Internet. This protocol is used to transmit data from the sending computer to the recipient’s electronic mail server.
c. HTTP (Hypertext Transfer Protocol, more commonly seen as http), is the protocol used to transfer documents on the World Wide Web (WWW). This protocol is a lightweight, unstated, and generic protocol that can be used for various types of documents.
d. POP3 (Post Office Protocol version 3) is a protocol used to retrieve electronic mail (e-mail) from an email server.
IMAP (Internet Message Access Protocol) is the standard protocol for accessing and retrieving e-mail from the server. IMAP allows the user to choose which e-mail messages he will retrieve, create folders on the server,
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