![]() Name servers store DNS records which are files that say “this domain” maps to “this IP address”. If the domain’s records are not cached, then the resolving name server will recurse up the DNS tree to find the server that is authoritative for the domain’s record. These name servers can also store caches (pronounced like cash) of DNS record information, so most queries for popular domains never end up reaching the authoritative name servers. Recursive name servers are commonly referred to as resolving servers, and usually are your ISP (Internet Service Provider)or specialty resolving DNS providers. For example, Google runs their own public recursive DNS servers. Recursive name servers are the “middlemen” between authoritative servers and end-users because they have to recurse up the DNS tree to reach the name servers authoritative for storing the domain’s records. Authoritative name servers store DNS record information –usually a DNS hosting provider or domain registrar.
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