You want to know the domain naming master
You can use Active Directory Domains and Trusts click on the second item of the right click menu. Here you can change the Domain Naming masters Role or can read which server is responsible at the moment.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience, including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform.