Internet TCP port 631 is primarily used by the Internet Printing Protocol (IPP) as a means to communicate with printers and printing devices over a network. This protocol is implemented in various software systems such as CUPS (Common Unix Printing System) which is a modular printing system for Unix-like computer operating systems. Additionally, Microsoft Windows also uses this port for its print services. Therefore, any software or system that requires network printing capabilities may use TCP port 631.
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