Test and ensure the availability of your DNS name servers using Site24x7's free tool.
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A name server is a type of DNS server that helps translate domain names into IP addresses. A name server stores all DNS records for a domain like A records, MX records, or CNAME records.
Domains depend on more than one name server to increase their reliability. When one of the name servers is not available, the queries will be forwarded to the next name server, which will have copies of the DNS records in the main server. Checking the performance of your name servers can help in ensuring that they are available.