rfc-4343

Domain Name System (DNS) Case Insensitivity Clarification

D. Eastlake 3rd

date2006-01 streamIETF areaint wgdnsext statusPROPOSED STANDARD pages10 canonicalhttps://www.rfc-editor.org/rfc/rfc4343 doi10.17487/RFC4343 errataview

Domain Name System (DNS) names are "case insensitive". This document explains exactly what that means and provides a clear specification of the rules. This clarification updates RFCs 1034, 1035, and 2181. [STANDARDS-TRACK]

updated by

rfc-5890 — Internationalized Domain Names for Applications (IDNA): Definitions and Document Framework

updates

rfc-1034 — Domain names - concepts and facilities
rfc-1035 — Domain names - implementation and specification
rfc-2181 — Clarifications to the DNS Specification