advancedGeneral
Glue Record
A special DNS record providing a nameserver's IP address when the nameserver is within the domain it serves.
A glue record is a DNS record that provides the IP address of a nameserver when the nameserver's hostname is within the domain it serves — breaking a circular dependency. For example, if ns1.example.com is the nameserver for example.com, resolvers need the IP of ns1.example.com to look up example.com. A glue record stored in the parent zone provides this IP directly, avoiding the circular lookup problem.