TCP/UDP Connections Port Number Reference

Nov 02, 2017 · Port numbers 0 to 1024 are reserved for privileged services and designated as well-known ports. This list of port numbers are specified in RFC 1700. In TCP/IP and UDP networks, a port is an endpoint to a logical connection and the way a client program specifies a specific server program on a computer in a network. A POP3 server listens on well-known port number 110 for service requests. Encrypted communication for POP3 is either requested after protocol initiation, using the STLS command, if supported, or by POP3S, which connects to the server using Transport Layer Security (TLS) or Secure Sockets Layer (SSL) on well-known TCP port number 995. TCP/IP used port numbers to differentiate between applications by assigning a unique 16-bit port number to each application protocol. For example, HTTP traffic today is standardized to use TCP port 80, SMTP uses TCP port 25, and FTP uses TCP ports 20 and 21. Mar 04, 2020 · Port 110 – non-encrypted port; Port 995 – SSL/TLS port, also known as POP3S; What is IMAP? IMAP (Internet Message Access Protocol), as opposed to POP3, is a two-way incoming mail protocol that only downloads email headers instead of its entire content. TCP. 80. HTTP is one of the most commonly used protocols on most networks. HTTP is the main protocol that is used by web browsers and is thus used by any client that uses files located on these servers. Post Office Protocol (POP) version 3 (RFC 1939) TCP. 110. POP version 3 is one of the two main protocols used to retrieve mail from a server. Add the port you need to open and click Next. Add the protocol (TCP or UDP) and the port number into the next window and click Next. Select Allow the connection in the next window and hit Next.

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