DNS analyzer - check subdomains and NS, etc.
Here are some useful sites related to DNS. You can check subdomains, NS resolution, and more.
https://www.whatsmydns.net/
This site shows you how far your DNS is propagating. When you switch DNS or change DNS settings, you can investigate how far it has propagated.
https://dnsdumpster.com/
Analyzes domains to extract information such as subdomains. You can use this site to check the subdomain information provided by your DNS server.
