is the IP address of the server to which you want to connect. Specify this address as: IP_address. For example, you can enter 199.226.224.34.
The IP address can be specified in either IPv4 or IPv6 format, or a combination of the two. See "Using IP Addresses" for details about these formats.
named_server
is the named server address of the server to which you want to connect. Specify this address as: named_server. For example, you can enter SSserver.
named_instance
is a named instance of Microsoft SQL Server, Windows Azure SQL Database, Microsoft Azure Synapse Analytics, or Microsoft Analytics Platform System. Specify this address as: server_name\instance_name.
virtual_network_name
is the virtual network name (VNN) of the availability group listener when using an Always On Availability Group.
Notes
If only a server name is specified with no instance name, the driver uses the default instance on the server.
If only a server name is specified with a backward slash \ or \* at the end with no instance name, the driver uses the first instance on the server with a TCP port.
If only a server name is specified with no instance name, the driver uses the default instance on the server.