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Unassigned
Port 10 is currently an unassigned port in the official IANA list. This means it does not have a designated service or protocol associated with it. In practice, unassigned ports like this are typically unused by default, but could be utilized arbitrarily by proprietary services, experimental applications, or during ephemeral port assignments. Care should be taken when monitoring or configuring security policies related to unassigned ports as their usage can vary widely or remain undefined..
Port 10 falls into the category of officially unassigned ports according to the IANA service name and transport protocol port number registry. No specific protocol, service, or standardized function is officially documented on this port. Given this, Port 10 is essentially a reserved or free port, lacking any typical or default application association.
Technically, an unassigned port like this can still be opened and bound by applications on TCP or UDP protocols as needed. It becomes a general-purpose port, and its usage is determined by the specific application or service configured to listen on it, rather than a well-defined, industry standard protocol.
For network administrators and security professionals, unassigned ports generally require monitoring during network scanning and analysis, as any identified usage is nonstandard and may warrant further investigation.