Port is registered with IANA for the application = Official
Port is not registered with IANA for the application = UnOfficial
Telnet = port - 23(Official)
FTP = port - 20(Data Tx), 21(Command), 22(SSH, Secured file Transfers and port forwarding)
HTTP = port - 80(Official)
RPC = port 530 (Official), 135(Unofficial-Microsoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service, used to remotely manage services including DHCP server, DNS server and WINS. Also used by DCOM)
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Port Registration with IANA
The Internet Assigned Numbers Authority (IANA) is responsible for assigning and managing port numbers used by various network protocols. When a port is registered with IANA, it means that the port number has been officially assigned for use by a specific application. This helps ensure that different applications can communicate with each other without conflicts.
Official and Unofficial Ports
In the context of port registration, an "official" port refers to a port number that has been officially assigned by IANA for use by a specific application. On the other hand, an "unofficial" port refers to a port number that is not officially registered with IANA for a specific application.
Telnet
Telnet is a network protocol used for remote terminal connections. It allows a user to log into a remote computer and execute commands as if they were directly interacting with the remote system. The official port number for Telnet is 23.
FTP
FTP (File Transfer Protocol) is a standard network protocol used for transferring files between a client and a server on a computer network. FTP uses different ports for different purposes. The data transfer is typically done on port 20, while the command and control communication is done on port 21.
HTTP
HTTP (Hypertext Transfer Protocol) is the protocol used for transmitting and receiving web pages and other resources on the World Wide Web. The official port number for HTTP is 80.
RPC
RPC (Remote Procedure Call) is a protocol that allows a computer program to execute a procedure on a remote system. RPC uses different port numbers for different purposes. The official port number for RPC is 530, and it is also commonly associated with port 135, which is used by Microsoft EPMAP (End Point Mapper) for remotely managing services.
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FAQs
Telnet is listening on TCP Port Number 23,FTP Data is on TCP Port Number 20,FTP Control TCP Port Number 21,HTTP is on TCP Port Number 80, HTTPS is on TCP Port Number 443 andRPC is on TCP Port Number 135.
What port is FTP and telnet? ›
In general, TELNET uses the port number 23 for its command operations. FTP uses port numbers 20 and 21 to establish a connection and perform file transfer operations.
What are the TCP port numbers of telnet, HTTP, FTP, and SMTP? ›
Table of Port numbers used for FTP, TELNET, HTTP, SMTP, POP3, IMAP, BIOS, SSH, DHCP protocols
| Port Number | Protocol description |
|---|
| 20, 21 | port number 20 is used for FTP data while port number 21 is used for FTP Control |
| 23 | Used for TELNET |
| 80, 8080 | HTTP |
| 443 | HTTPS |
14 more rowsBy default, these two protocols are on their standard port number of 80 for HTTP and 443 for HTTPS.
What is the port number for FTP? ›
The FTP default port generally helps when making standards, and an unencrypted FTP connection is port 21. That is the number that anyone using an FTP client needs to know. You can use more ports, but they differ with the type of FTP. Standard FTP ports can be ports 20 and 21 since FTP was officially assigned both.
What port is for telnet? ›
What port is used for telnet? The telnet protocol runs on TCP port 23.
What port is open for FTP? ›
To run an FTP server, you need to open ports 20 and 21 for FTP control and data transfer. However, if you are using passive mode FTP, you may need to open additional ports as well. You can consult your FTP server documentation or network administrator for further guidance on which ports to open.
What is HTTP FTP and Telnet? ›
On the web, HTTP and File Transfer Protocol (FTP) enable users to request specific files from remote computers. With Telnet, users can log on as a regular user with privileges that allow them to access the specific applications and data on that computer.
What are the SMTP port numbers? ›
Originally, the Simple Mail Transfer Protocol (SMTP) used port 25. Today, SMTP should instead use port 587 — this is the port for encrypted email transmissions using SMTP Secure (SMTPS). Port 465 is also used sometimes for SMTPS. However, this is an outdated implementation and port 587 should be used if possible.
What port is Telnet SMTP? ›
Telnet will use port 23 by default if you don't enter a port number at the end of the open command. Port 23 won't get you into your SMTP server. SMTP uses three ports: 25, 465, and 587. All of the other advice pages on the web that include tips on how to access SMTP with Telnet tell you to use port 25.
There are 65,535 possible port numbers, although not all are in common use.
Is HTTP port 80 or 443? ›
Port 443 is encrypted, but port 80 is not, which is a crucial difference between the two. Port 80 is, by default, unencrypted to access internet pages, as HTTP is an insecure form of communication. Port 443 is secure because it uses HTTPS, a secure variant of port 80, to achieve the same objectives.
Why is HTTP always port 80? ›
To make it convenient for programmers, most popular network services are assigned “well-known” port numbers by default. This strategy began back in 1991 when Tim Berners-Lee's original specification for HTTP stated that if there was no port assigned to an HTTP connection, Port 80 should be used.
What port is HTTPS? ›
Port 443. HTTP Secure (HTTPS) is like HTTP but more secure. All HTTPS web traffic goes straight to port 443. Any network service that uses HTTPS for encryption, such as DNS over HTTPS, also connects directly to this port.
How to check if an FTP port is open or not? ›
FTP works on TCP port 21. Simply do a telnet to the IP address with port 21 “telnet x.x.x.x 21” or run an NMAP scan : nmap x.x.x.x -p 21.. If the telnet command gives an output as “Connected” or if the NMAP output gives the port as “Open”, the FTP port on that server is Open.
What port is SFTP? ›
SFTP uses port number 22 by default, facilitating secure data movement over a single internet connection. This SFTP port assignment allows SFTP to offer enhanced security and simplicity compared to other protocols like FTP/S, which require multiple ports.
Is port 22 used for FTP? ›
SFTP uses port number 22 by default, facilitating secure data movement over a single internet connection. This SFTP port assignment allows SFTP to offer enhanced security and simplicity compared to other protocols like FTP/S, which require multiple ports.
Is FTP port 21 TCP or UDP? ›
FTP is a TCP based service exclusively. There is no UDP component to FTP. FTP is an unusual service in that it utilizes two ports, a 'data' port and a 'command' port (also known as the control port). Traditionally these are port 21 for the command port and port 20 for the data port.
Why does FTP use port 20 and 21? ›
Ports 20 and 21: These Ports are used for FTP (file transfer protocol) connection. FTP uses two TCP connections for communication. Port 21 is used for pass control information. And the other port 20 is used to send the data files between the client and the server.
What is the basic port for FTP? ›
Originally, the Simple Mail Transfer Protocol (SMTP) used port 25. Today, SMTP should instead use port 587 — this is the port for encrypted email transmissions using SMTP Secure (SMTPS). Port 465 is also used sometimes for SMTPS. However, this is an outdated implementation and port 587 should be used if possible.
