In Master Files and other human-readable and -writable ASCIIĬontexts, an escape is needed for the byte value for period (0x2E, Many applications, however, interpret them They are 8-bit bytes, andĪll values are allowed. However, the individual octets of which DNS names consist are not Part after the at-sign, or to be numeric, as in the in-addr.arpaĬase-varied alternatives to the above would be DNS names Look like most host names or Internet email address right halves (the "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in thisĭocument are to be interpreted as described in. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", Of zero or more labels that are treated inĪ case insensitive fashion. Each node in the DNS tree has a name consisting The Domain Name System (DNS) is the global hierarchical replicatedĭistributed database system for Internet addressing, mail proxy, and RFC 4343 DNS Case Insensitivity Clarification January 2006 1. Extended Label Type Case Insensitivity Considerations. This clarification updates RFCs 1034, 1035, and 2181.ġ. This documentĮxplains exactly what that means and provides a clear specification Distribution of this memo is unlimited.Ĭopyright (C) The Internet Society (2006).ĭomain Name System (DNS) names are "case insensitive". Official Protocol Standards" (STD 1) for the standardization stateĪnd status of this protocol. Please refer to the current edition of the "Internet Internet community, and requests discussion and suggestions for This document specifies an Internet standards track protocol for the Request for Comments: 4343 Motorola Laboratoriesĭomain Name System (DNS) Case Insensitivity Clarification
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