Glue record意思

"Glue record" is a term used in the context of DNS (Domain Name System), which is the system that translates human-readable domain names into machine-readable IP addresses.

A glue record is a special type of DNS record that is used to provide the authoritative name server information for a domain that is not directly under the root zone or a top-level domain (TLD) server. When a domain is registered, it must point to a set of name servers that are authoritative for that domain. These name servers are responsible for resolving the domain name to the correct IP address.

In some cases, a domain may be delegated to a name server that is not part of the same zone. For example, a company might use a third-party DNS service to manage their DNS records. In this case, the glue record is used to provide the IP addresses of the name servers that will be authoritative for the domain.

Without glue records, the DNS system would not be able to resolve domains that are not directly under the root zone or a TLD server. Glue records ensure that the DNS system can correctly find the authoritative name servers for a domain, which is essential for the proper functioning of the DNS system.