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They are used by system processes that provide widely used types of network services.
Similarly many of the official assignments refer to protocols that were never or are no longer in common use.
This article lists port numbers and their associated protocols that have experienced significant uptake.
The Stream Control Transmission Protocol (SCTP) and the Datagram Congestion Control Protocol (DCCP) also use port numbers.
They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist.
Prior to version 4.0, BES was largely two separate codebases, with the 2.2 version for Domino and the 3.6 version for Exchange.
In version 4.0 and beyond, much of the code is integrated, but separate distributions still remain for each supported mail platform.Later, the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) needed only one port for full-duplex, bidirectional traffic.The even-numbered ports were not used, and this resulted in some even numbers in the well-known port number range being unassigned.To support the growing number of multiple devices, ownership models, and operating environments, Black Berry reinvented Enterprise Mobility Management (EMM) by bringing together Mobile Device Management, Security, Unified Communications and Applications by launching Black Berry Enterprise Service 10 (BES 10).This represents the unification and simplification of its products to deliver an integrated and end-to-end solution.Beginning with version 4.1.2, the company introduced a new option, Black Berry Enterprise Server for Applications, which provides a secure wireless gateway for Black Berry devices without requiring the device owner to possess an email account.