How to get FQDN (fully qualified domain name) from SQL Server?

A fully qualified domain name (FQDN) is referred to as an absolute domain name, is a domain name that specifies its exact location in the tree hierarchy of the Domain Name System (DNS).

You can see this information easily throughput Control Panel – > System and Security – > System – > Look out “Computer name, domain and workgroup settings”

But, I was looking for some way to identify this information without switching my windows (actually I was working on something when I was asked this information) .

Select DEFAULT_DOMAIN()
EXEC master..xp_loginconfig 'Default Domain'

DECLARE @rootkey varchar(100) = 'HKEY_LOCAL_MACHINE',
@key varchar(100) = 'SYSTEM\ControlSet001\Services\Tcpip\Parameters\',
@value_name varchar(100) = 'Domain',@Domain_Name sysname -- output parameters
--Using xp_regread
EXEC master..xp_regread @rootkey = @rootkey, @key = @key, @value_name=@value_name
--Using xp_instance_regread
EXECUTE master.sys.xp_instance_regread
    @rootkey = @rootkey, @key = @key, @value_name=@value_name

/* Incase you need to assign to a variable*/
EXEC master..xp_regread @rootkey = @rootkey, @key = @key, @value_name=@value_name,@value=@Domain_Name OUTPUT 
SELECT @Domain_Name 'Domain Name'

Set @Domain_Name = ''

EXECUTE master.sys.xp_instance_regread
    @rootkey = @rootkey, @key = @key, @value_name=@value_name,@value=@Domain_Name OUTPUT 

SELECT @Domain_Name 'Domain Name'
Since, its domain information, I am not providing the screenshot, you may try it out yourself and share your thoughts.

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