This allows many stub resolvers to collectively share the cache of the recursive DNS resolver. Instead, they talk to a recursive DNS resolver which performs recursion on their behalf. Stub resolvers don't perform recursion themselves.
The stub resolver sends the DNS request messages to a DNS recursive resolver and returns the result to the application. Stub resolvers were first formally defined in 1989 in section 6 of RFC 1123.Ī stub resolver converts name resolution requests from applications like web browsers into DNS request messages. It relies on the services of a recursive DNS resolver. The word stub refers to something that's partial or a subset of something larger.Ī stub resolver is a partial DNS resolver. Taking you where you need to go, without executing the work itself. A DNS stub resolver is an operating system component that performs DNS name resolution for applications running on a computer, cell phone, or another Internet-connected device.
