21: File Transfer Protocol (FTP) control channel.20: File Transfer Protocol (FTP) data channel.Bear with me, because the list is hefty, but hopefully it will serve as a useful reference guide for you. These are the most commonly used ports, alongside their port numbers.

Skip to Open Port Scanners and Checkers List > Commonly Used Ports Port numbers are set and correspond to the function for which each port is responsible. In this instance, ports would determine where the request goes, guiding a web server request through port 80 and an FTP server request through port 21. When the server gets an inbound request, the operating system has to decide whether to send the request to the FTP or web server. This is a normal and frequent combination. In practice, port use looks something like this: imagine a server is running an FTP server and a web server simultaneously. Ports are the solution to this issue, allowing multiple processes and activities to have access to a shared network interface. The issue with this is usually devices only have a single network interface. Your hardware is constantly managing multiple activities and tasks at once, and many of these will require network access. These gateways exist in the network and can be points of vulnerability. PortScan & Stuff 1.94 Portable (988.You might describe ports as gates into your hardware. The scan result can be saved in XML format.Checking the speed of your Internet connection.Displays details about discovered devices.Search for different active devices on the network.PortScan also makes it possible to check Internet speed, perform tracing, search for connected devices and ping any computer on the network. Using the Whois service, you can find out basic information about a domain name. After scanning, the program shows all open ports, host name, MAC address, HTTP, SMB, FTP, ISCSI, SMTP services and other information. PortScan & Stuff is a free utility that allows you to find all active devices on your network. Interface language: Russian, English and others PortScan & Stuff 1.94 Portable | 988.27 KB |

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