AXFR request

Definition of AXFR request in The Network Encyclopedia.

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What is AXFR request?

A type of Domain Name System (DNS) request in which a secondary DNS server requests the update of information from a master DNS server. An AXFR request always results in a full zone transfer.

This can take time and use considerable network bandwidth if the zone files are large. An alternative to AXFR is the incremental zone transfer protocol described in Request for Comments (RFC) number 1995.

Incremental zone transfers use an IXFR request and transfer only those portions of the zone file that have been changed. Incremental zone transfers are supported by the DNS service running on Microsoft Windows 2000.