Editing DNS zone transfer (section)

{{Short description|Type of DNS transaction}}
'''DNS zone transfer''', also sometimes known by the inducing DNS query type '''AXFR''', is a type of [[Domain Name System|DNS]] [[Database transaction|transaction]]. It is one of the many mechanisms available for administrators to [[distributed database|replicate]] DNS databases across a set of [[DNS server]]s.

A zone transfer uses the [[Transmission Control Protocol]] (TCP) for transport,<ref name=":0">{{Cite journal|date=November 1987|title=Domain names - implementation and specification|url=https://datatracker.ietf.org/doc/rfc1035/|journal=IETF}}</ref><ref name=":1">{{Cite journal|last1=Dickinson|first1=John|last2=Dickinson|first2=Sara|last3=Bellis|first3=Ray|last4=Mankin|first4=Allison|last5=Wessels|first5=Duane|date=March 2016|title=DNS Transport over TCP - Implementation Requirements|url=https://datatracker.ietf.org/doc/rfc7766/|journal=IETF}}</ref> and takes the form of a [[client–server]] transaction. The client requesting a zone transfer may be a secondary server requesting data from a [[Domain Name System#Authoritative name server|primary server]].<ref>{{Cite journal|last1=Fujiwara|first1=Kazunori|last2=Sullivan|first2=Andrew|last3=Hoffman|first3=Paul|title=DNS Terminology|url=https://tools.ietf.org/html/rfc8499.html|access-date=2020-06-21|website=tools.ietf.org|year=2019 |doi=10.17487/RFC8499 |language=en|url-access=subscription}}</ref> The portion of the database that is replicated is a [[DNS zone|zone]].