I guess I am confused by that...
All instances installed have to have a name - whether it is the default instance or a named instance. The default instance has a name - which is MSSQLSERVER. All named instances are just that - named....
Referencing a default instance can be done using either the server name or the IP address, whereas referencing a named instance must be done using the server name\instance name or IP:port.
Jeffrey Williams
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Managing Transaction Logs