<P> A Domain Name System (DNS) zone file is a text file that describes a DNS zone . A DNS zone is a subset, often a single domain, of the hierarchical domain name structure of the DNS . The zone file contains mappings between domain names and IP addresses and other resources, organized in the form of text representations of resource records (RR). A zone file may be either a DNS master file, authoritatively describing a zone, or it may be used to list the contents of a DNS cache . </P> <P> The format of a zone file is defined in RFC 1035 (section 5) and RFC 1034 (section 3.6. 1). This format was originally used by the Berkeley Internet Name Domain (BIND) software package, but has been widely adopted by other DNS server software--though some of them (e.g. NSD, PowerDNS) are using the zone files only as a starting point to compile them into database format, see also Microsoft DNS with Active Directory - database integration . </P> <P> A zone file is a sequence of entries for resource records . Each line is a text description that defines a single resource record (RR). The description consists of several fields separated by white space (spaces or tabs) as follows: </P> <Table> <Tr> <Td> name </Td> <Td> ttl </Td> <Td> record class </Td> <Td> record type </Td> <Td> record data </Td> </Tr> </Table>

What are the fields (rows) required for a dns entry