Connected: An Internet Encyclopedia
3.2.1. Format
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Requests For Comments
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RFC 1035
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3. DOMAIN NAME SPACE AND RR DEFINITIONS
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3.2. RR definitions
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Next: 3.2.2. TYPE values
3.2.1. Format
3.2.1. Format
All RRs have the same top level format shown below:
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
NAME
|
TYPE |
CLASS |
TTL |
TTL |
RDLENGTH |
RDATA
|
where:
- NAME
- an owner name, i.e., the name of the node to which this
resource record pertains.
- TYPE
- two octets containing one of the RR TYPE codes.
- CLASS
- two octets containing one of the RR CLASS codes.
- TTL
- a 32 bit signed integer that specifies the time interval
that the resource record may be cached before the source
of the information should again be consulted. Zero
values are interpreted to mean that the RR can only be
used for the transaction in progress, and should not be
cached. For example, SOA records are always distributed
with a zero TTL to prohibit caching. Zero values can
also be used for extremely volatile data.
- RDLENGTH
- an unsigned 16 bit integer that specifies the length in
octets of the RDATA field.
- RDATA
- a variable length string of octets that describes the
resource. The format of this information varies
according to the TYPE and CLASS of the resource record.
Next: 3.2.2. TYPE values
Connected: An Internet Encyclopedia
3.2.1. Format