Glue Record

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A Glue Record is needed if the zone is delegated to a name server whose domain name is a subdomain of the zone. At that point you have a circular dependency and an A Record (Glue Record) is created as part of the delegation.  is a subdomain of the domain for which the delegation is being provided, there is a circular dependency. In this case the nameserver providing the delegation must also provide at least one IP address for the authoritative nameserver mentioned in the delegation.

See also:
Zone
Name Server
A Record
Delegation
IP Address
Authoritative
Resource Record

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