Name Server

Nameserver

Name Server hierarchy

Name Server types

Recursive DNS Server

Name Servers

PDNS

The optimal approach for a domain when considering both performance and operational resilience is for the domain to be served by two distinct dual-stack diverse anycast nameservers.

While it may seem that increasing the number of nameservers would improve stability, in reality there are no significant benefits to having more than 6 servers.

For domains with

DNSSEC enabled, nameserver configuration and key management become more complex. This requires additional considerations.

ISP Column - December 2024

It's common folklore in the Domain Name System that a delegated domain name must be served by 2 or more nameservers. The logic for this is based in a desire for service resilience. If one server is unreachable then hopefully the other is not, and recursive resolvers when presented with a list two or more nameservers for a domain will work through this list until it queries a nameserver that is responsive.

https://www.potaroo.net/ispcol/2024-12/nameservers.html

Name server

A name server is a computer application that implements a network service for providing responses to queries against a directory service. It translates an often humanly meaningful, text-based identifier to a system-internal, often numeric identification or addressing component. This service is performed by the server in response to a service protocol request.

https://en.wikipedia.org/wiki/Name_server