Overview#

That is, a value of this attribute is a string of ASCII characters adhering to the following ABNF RFC 4234:

label = (ALPHA / DIGIT) [*61(ALPHA / DIGIT / HYPHEN) (ALPHA / DIGIT)]
ALPHA   = %x41-5A / %x61-7A     ; "A"-"Z" / "a"-"z"
DIGIT   = %x30-39               ; "0"-"9"
HYPHEN  = %x2D                  ; hyphen ("-")

The encoding of IA5String for use in LDAP is simply the characters of the ASCII label. The EQUALITY Matching Rule is Case-insensitive, as is today's DNS. (Source: RFC 2247 and RFC 1274)

LDAP Attribute Definition#

• OID of 0.9.2342.19200300.100.1.25
• NAME: DomainComponent DC
• DESC:
• EQUALITY: caseIgnoreIA5Match
• SUBSTR: caseIgnoreIA5SubstringsMatch
• ORDERING:
• SYNTAX: 1.3.6.1.4.1.1466.115.121.1.26
• SINGLE-VALUE
• USAGE: UserApplications
• Extended Flags:
  • X-ORIGIN: RFC 4519
• Used as MUST in:
  • domain
  • dcObject
  • nisDomain
• Used MAY in:

Examples#

It is noted that the Directory Service will not ensure that values of this attribute conform to the host label restrictions RFC 1123 illustrated by the <label> production provided above. It is the directory client's responsibility to ensure that the labels it stores in this attribute are appropriately restricted.

Directory applications supporting International Domain Names SHALL use the ToASCII method RFC 3490 to produce the DomainComponent label. The special considerations discussed in Section 4 of RFC 3490 should be taken, depending on whether the DomainComponent is used for "stored" or "query" purposes.

More Information#

• 0.9.2342.19200300.100.1.25
• DC
• LDAP Object Identifier Descriptors