I understand that you want to know how to pass an IP address as an input to a masked subsystem.
IP addresses can be stored or passed as strings in the MATLAB environment and thus enclosing the address in single quotes should help resolve the issue.
To illustrate with an example, let the IP address be 127.0.0.1, it can be specified in a mask as follows:
'127.0.0.1'
instead of
127.0.0.1
The second definition would result in an error related to unexpected expression.
Another way to pass this data could be to define a workspace variable as a character datatype and use that variable name in the mask.
>> IP_addr = '127.0.0.1';
Here, IP_addr was defined in MATLAB workspace and can be used as input to mask.
