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Network Working Group P. Mockapetris |
Request for Comments: 1035 ISI |
November 1987 |
Obsoletes: RFCs 882, 883, 973 |
DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION |
1. STATUS OF THIS MEMO |
This RFC describes the details of the domain system and protocol, and |
assumes that the reader is familiar with the concepts discussed in a |
companion RFC, "Domain Names - Concepts and Facilities" [RFC-1034]. |
The domain system is a mixture of functions and data types which are an |
official protocol and functions and data types which are still |
experimental. Since the domain system is intentionally extensible, new |
data types and experimental behavior should always be expected in parts |
of the system beyond the official protocol. The official protocol parts |
include standard queries, responses and the Internet class RR data |
formats (e.g., host addresses). Since the previous RFC set, several |
definitions have changed, so some previous definitions are obsolete. |
Experimental or obsolete features are clearly marked in these RFCs, and |
such information should be used with caution. |
The reader is especially cautioned not to depend on the values which |
appear in examples to be current or complete, since their purpose is |
primarily pedagogical. Distribution of this memo is unlimited. |
Table of Contents |
1. STATUS OF THIS MEMO 1 |
2. INTRODUCTION 3 |
2.1. Overview 3 |
2.2. Common configurations 4 |
2.3. Conventions 7 |
2.3.1. Preferred name syntax 7 |
2.3.2. Data Transmission Order 8 |
2.3.3. Character Case 9 |
2.3.4. Size limits 10 |
3. DOMAIN NAME SPACE AND RR DEFINITIONS 10 |
3.1. Name space definitions 10 |
3.2. RR definitions 11 |
3.2.1. Format 11 |
3.2.2. TYPE values 12 |
3.2.3. QTYPE values 12 |
3.2.4. CLASS values 13 |
Mockapetris [Page 1] |
RFC 1035 Domain Implementation and Specification November 1987 |
3.2.5. QCLASS values 13 |
3.3. Standard RRs 13 |
3.3.1. CNAME RDATA format 14 |
3.3.2. HINFO RDATA format 14 |
3.3.3. MB RDATA format (EXPERIMENTAL) 14 |
3.3.4. MD RDATA format (Obsolete) 15 |
3.3.5. MF RDATA format (Obsolete) 15 |
3.3.6. MG RDATA format (EXPERIMENTAL) 16 |
3.3.7. MINFO RDATA format (EXPERIMENTAL) 16 |
3.3.8. MR RDATA format (EXPERIMENTAL) 17 |
3.3.9. MX RDATA format 17 |
3.3.10. NULL RDATA format (EXPERIMENTAL) 17 |
3.3.11. NS RDATA format 18 |
3.3.12. PTR RDATA format 18 |
3.3.13. SOA RDATA format 19 |
3.3.14. TXT RDATA format 20 |
3.4. ARPA Internet specific RRs 20 |
3.4.1. A RDATA format 20 |
3.4.2. WKS RDATA format 21 |
3.5. IN-ADDR.ARPA domain 22 |
3.6. Defining new types, classes, and special namespaces 24 |
4. MESSAGES 25 |
4.1. Format 25 |
4.1.1. Header section format 26 |
4.1.2. Question section format 28 |
4.1.3. Resource record format 29 |
4.1.4. Message compression 30 |
4.2. Transport 32 |
4.2.1. UDP usage 32 |
4.2.2. TCP usage 32 |
5. MASTER FILES 33 |
5.1. Format 33 |
5.2. Use of master files to define zones 35 |
5.3. Master file example 36 |
6. NAME SERVER IMPLEMENTATION 37 |
6.1. Architecture 37 |
6.1.1. Control 37 |
6.1.2. Database 37 |
6.1.3. Time 39 |
6.2. Standard query processing 39 |
6.3. Zone refresh and reload processing 39 |
6.4. Inverse queries (Optional) 40 |
6.4.1. The contents of inverse queries and responses 40 |
6.4.2. Inverse query and response example 41 |
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