Internet TCP port 105 is commonly used by the Mailbox Name Nameserver (MBNS) protocol. This protocol is utilized in the CCSO Nameserver (Ph) system, a simple database system developed at the University of Illinois. It is primarily used for maintaining and querying a directory of names, email addresses, and phone numbers. However, it's worth noting that this system is largely obsolete and has been largely replaced by more modern systems.
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