What this tool does
Nameservers (NS records) are the servers that hold a domain's authoritative DNS. This lookup lists them so you can confirm your domain points at the right DNS provider, spot a partial migration, or check redundancy. Two or more nameservers across different providers is healthy; a single one is a single point of failure.
Frequently asked questions
How many nameservers should a domain have?
At least two, and ideally on diverse infrastructure. Most registrars and DNS providers give you several by default so that a single outage doesn't take your domain offline.
Why did my nameservers change?
Nameserver changes happen when you move DNS providers or registrars. An unexpected change can indicate a misconfiguration or, rarely, a domain hijack, so they're worth monitoring.
Are these the same as the registrar's nameservers?
Usually, but not always. The registry publishes the delegated nameservers; this tool reads what DNS actually returns, which is what resolvers use.