Character Sets

Last Updated

2024-06-06

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Registry Included Below

• Character Sets

Character Sets

Registration Procedure(s)

Expert Review

Expert(s)

Martin Dürst

Reference

[RFC 2978]

Note

These are the official names for character sets that may be used in
the Internet and may be referred to in Internet documentation.  These
names are expressed in ANSI_X3.4-1968 which is commonly called
US-ASCII or simply ASCII.  The character set most commonly use in the
Internet and used especially in protocol standards is US-ASCII, this
is strongly encouraged.  The use of the name US-ASCII is also
encouraged.

The character set names may be up to 40 characters taken from the
printable characters of US-ASCII.  However, no distinction is made
between use of upper and lower case letters.

The MIBenum value is a unique value for use in MIBs to identify coded
character sets.

The value space for MIBenum values has been divided into three
regions. The first region (3-999) consists of coded character sets
that have been standardized by some standard setting organization.
This region is intended for standards that do not have subset
implementations. The second region (1000-1999) is for the Unicode and
ISO/IEC 10646 coded character sets together with a specification of a
(set of) sub-repertoires that may occur.  The third region (>1999) is
intended for vendor specific coded character sets.

        Assigned MIB enum Numbers
        -------------------------
        0-2             Reserved
        3-999           Set By Standards Organizations
        1000-1999       Unicode / 10646
        2000-2999       Vendor

The aliases that start with "cs" have been added for use with the
IANA-CHARSET-MIB as originally defined in [RFC 3808], and as currently
maintained by IANA at [IANA registry ianacharset-mib].
Note that the ianacharset-mib needs to be kept in sync with this
registry.  These aliases that start with "cs" contain the standard
numbers along with suggestive names in order to facilitate applications
that want to display the names in user interfaces.  The "cs" stands
for character set and is provided for applications that need a lower
case first letter but want to use mixed case thereafter that cannot
contain any special characters, such as underbar ("_") and dash ("-").

If the character set is from an ISO standard, its cs alias is the ISO
standard number or name.  If the character set is not from an ISO
standard, but is registered with ISO (IPSJ/ITSCJ is the current ISO
Registration Authority), the ISO Registry number is specified as
ISOnnn followed by letters suggestive of the name or standards number
of the code set.  When a national or international standard is
revised, the year of revision is added to the cs alias of the new
character set entry in the IANA Registry in order to distinguish the
revised character set from the original character set.

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