What is stub Zone?

A stub zone is a read only copy of a zone that contains only those resource records which are necessary to identify the authoritative DNS servers for that particular zone. A stub zone is practically used to resolve names between separate DNS namespaces. This type of zone is generally created when a corporate merger or acquire and DNS servers for two separate DNS namespaces resolve names for clients in both namespaces.

A stub zone contains:
The start of authority (SOA) resource record, name server (NS) resource records, and the glue A resource records for the delegated zone.
The IP address of one or more master servers that can be used to update the stub zone.

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