Internet TCP port 138 is primarily used by the Microsoft Windows operating system for the NetBIOS Datagram Service. This service is part of the NetBIOS-over-TCP protocol suite, allowing applications on separate computers to communicate over a local area network. As an example, Windows' file and printer sharing uses this system. It's also used by the SMB (Server Message Block) protocol for providing shared access to files, printers, and serial ports.
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