Internet UDP port 3671 is commonly used by the KNXnet/IP protocol, a standard for commercial and domestic building automation. KNXnet/IP extends the KNX communication to the IP networking technology, allowing for smart home and building solutions. Devices such as heating, lighting, or security systems that use the KNXnet/IP protocol communicate over port 3671. This port is also used by the Trivial File Transfer Protocol (TFTP), a simple, lock-step FTP that allows a client to get or put a file onto a remote host.
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