RFC 1123

(networking, standard)RFC 1123 - The RFC "Requirements for Internet Hosts Application and Support" which clarifies or changes the specification of protocols given in earlier RFCs.

RFC 1123 defines the terms "MUST", "SHOULD", "MAY", "unconditionally compliant", "conditionally compliant". Capitals are used to emphasise that the official definition of the word is being used.

MUST or REQUIRED means an absolute requirement for conformance.

SHOULD or RECOMMENDED means the item can be ignored under certain circumstances, although the full implications should be understood.

MAY or OPTIONAL means the implementor can choose, usually depending on whether it is needed or not.

Something "unconditionally compliant" meets all the MUST and SHOULD requirements, "conditionally compliant" meets all the MUST requirements and "not compliant" - does not meet some MUST requirement.

For example, RFC 1123 amends RFC952 to say software MUST handle either a letter or a digit as the first character of a hostname.

RFC 1014
RFC 1034
RFC 1035
RFC 1057
RFC 1058
RFC 1081
RFC 1094
RFC 1112
RFC 1119
-- RFC 1123 --
RFC 1156
RFC 1157
RFC 1171
RFC 1208
RFC 1213
RFC 1267
RFC 1268
RFC 1304
RFC 1321
RFC 1334
RFC 1341
RFC 1347
RFC 1350
RFC 1388
RFC 1436
RFC 1441
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