Siemens Simantic Net NCM for Industrial Ethernet S7 - Manual (Page 124)

Configuring Communication Connections
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SIMATIC NET NCM S7 for Industrial Ethernet
C79000-G8976-C129–06
Addresses Tab – Unspecified TCP Connection
If you select the partner type as “unspecified”, depending on your task, you can
enter address information about the communication partner here. The options
available to you are explained in detail in Section 4.3.1.
The Addresses tab shown here illustrates the situation in which the remote port but
not the IP address was specified. If you make no further entries, you are accepting
connection establishment with any communication partner that uses the specified
port.
Figure 4-20