Glue record

What is a glue record?

A glue record is a type of DNS record that is used to associate a domain name with an IP address. This is necessary when a domain name's authoritative nameservers are located within the same domain itself. Without a glue record, there would be a circular dependency issue where the nameserver for the domain would need to be resolved before the IP address of the nameserver could be determined.

When a domain name is registered, the registrar will typically provide a way for the owner to set up the necessary glue records. This involves adding a special type of record to the parent domain's DNS zone file that contains the IP address of the nameserver for the domain. This allows other DNS servers to resolve the domain name to the correct IP address without encountering any circular dependencies.

Glue records are essential for ensuring that domain names can be properly resolved to their corresponding IP addresses. Without them, the DNS resolution process would break down, leading to potential downtime and accessibility issues for websites and other online services. By properly configuring glue records, domain owners can ensure that their websites and services remain accessible to users around the world.