What is the command-line tool for determining whether a domain controller has been registered in DNS?

The command-line tool used to check if a domain controller has been registered in DNS is nslookup. By using the command nslookup <DomainControllerName>, you can query the DNS records to determine if the specified domain controller is listed. Additionally, the command dcdiag /test:dns can be used for a more comprehensive assessment of the domain controller's DNS registration and health.