Message Send Protocol

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The Message Send Protocol (MSP), more precisely referred to as Message Send Protocol 2,[1] is an application layer protocol used to send a short message between nodes on a network.

TCP-based service[edit]

One message send service is defined as a connection-based application on TCP. A service listens for TCP connections on port 18. Once a connection is established, a short message is transmitted from the sender to the receiver over the connection. The sender closes the connection after sending the message.

UDP-based service[edit]

Another message send service is defined as a datagram-based application on UDP. A service listens for UDP datagrams on port 18. When a datagram is received by the receiver, an answering datagram is sent back to the sender containing exactly the same data.

See also[edit]


  1. ^ RFC 1312 Message Send Protocol 2

External links[edit]