Port 20 (UDP) holds File Transfer Protocol (FTP) used for data transfer.You may recognize some of the more prominent ports and their assigned services: These ports are held by top-tier companies like Apple QuickTime, MSN, SQL services, and other prominent organizations. They are administered by the Internet Assigned Numbers Authority (IANA). Ports 0 to 1023 are well known port numbers that are designed for Internet use although they can have specialized purposes as well. Ports range from 0 to 65,536 and basically rank by popularity. The port number combined with an IP address form the vital information kept by every Internet Service Provider in order to fulfill requests. Port numbers are used for consistency and programming. Think of it as the parking spot for data to be exchanged through electronic, software, or programming-related mechanisms. Computer ports are the central docking point for the flow of information from a program or the Internet, to a device or another computer in the network and vice versa.
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