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<HTML><HEAD> <TITLE>BBS水木清华站∶精华区</TITLE></HEAD><BODY><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER>Network Working Group P. Mockapetris <BR>Request for Comments: 1035 ISI <BR> November 1987 <BR>Obsoletes: RFCs 882, 883, 973 <BR> <BR> DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION <BR> <BR> <BR>1. STATUS OF THIS MEMO <BR> <BR>This RFC describes the details of the domain system and protocol, and <BR>assumes that the reader is familiar with the concepts discussed in a <BR>companion RFC, "Domain Names - Concepts and Facilities" [RFC-1034]. <BR> <BR>The domain system is a mixture of functions and data types which are an <BR>official protocol and functions and data types which are still <BR>experimental. Since the domain system is intentionally extensible, new <BR>data types and experimental behavior should always be expected in parts <BR>of the system beyond the official protocol. The official protocol parts <BR>include standard queries, responses and the Internet class RR data <BR>formats (e.g., host addresses). Since the previous RFC set, several <BR>definitions have changed, so some previous definitions are obsolete. <BR> <BR>Experimental or obsolete features are clearly marked in these RFCs, and <BR>such information should be used with caution. <BR> <BR>The reader is especially cautioned not to depend on the values which <BR>appear in examples to be current or complete, since their purpose is <BR>primarily pedagogical. Distribution of this memo is unlimited. <BR> <BR> Table of Contents <BR> <BR> 1. STATUS OF THIS MEMO 1 <BR> 2. INTRODUCTION 3 <BR> 2.1. Overview 3 <BR> 2.2. Common configurations 4 <BR> 2.3. Conventions 7 <BR> 2.3.1. Preferred name syntax 7 <BR> 2.3.2. Data Transmission Order 8 <BR> 2.3.3. Character Case 9 <BR> 2.3.4. Size limits 10 <BR> 3. DOMAIN NAME SPACE AND RR DEFINITIONS 10 <BR> 3.1. Name space definitions 10 <BR> 3.2. RR definitions 11 <BR> 3.2.1. Format 11 <BR> 3.2.2. TYPE values 12 <BR> 3.2.3. QTYPE values 12 <BR> 3.2.4. CLASS values 13 <BR> <BR> <BR> <BR>Mockapetris [Page 1] <BR> <BR>RFC 1035 Domain Implementation and Specification November 1987 <BR> <BR> <BR> 3.2.5. QCLASS values 13 <BR> 3.3. Standard RRs 13 <BR> 3.3.1. CNAME RDATA format 14 <BR> 3.3.2. HINFO RDATA format 14 <BR> 3.3.3. MB RDATA format (EXPERIMENTAL) 14 <BR> 3.3.4. MD RDATA format (Obsolete) 15 <BR> 3.3.5. MF RDATA format (Obsolete) 15 <BR> 3.3.6. MG RDATA format (EXPERIMENTAL) 16 <BR> 3.3.7. MINFO RDATA format (EXPERIMENTAL) 16 <BR>
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