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SQL Service
Port 156 is officially assigned for SQL Services Provided over either TCP or UDP. It typically facilitates communications in distributed database management systems, allowing database access, synchronization, and replication between servers or clients over a network environment. While not as universally standard as other database ports (like 1433 for Microsoft SQL Server), port 156 can be employed in specific legacy or specialized IBM database environments..
Port 156 is officially reserved by IANA for SQL Services, predominantly associated with IBM's Distributed Data Management (DDM) protocol used in their database solutions such as DB2. This port supports the exchange of structured query language (SQL) commands and data transport in distributed database environments, enabling client applications to remotely access and manipulate data.
Being capable of operating over both TCP and UDP, port 156 provides versatile transport methods: TCP is typically preferred for its reliability during database transactions, whereas UDP may be implemented in scenarios that require lightweight queries with minimal latency or in specific IBM data synchronization protocols.
Historically, this port is more prevalent in legacy IBM database setups rather than modern SQL deployments, which tend to use other well-known ports. Nevertheless, where IBM DB2 mainframes or distributed database solutions still exist, port 156 remains relevant for inter-system SQL communications and command execution.