Bind 9 secondary name server not updating
Although not intended to be a general purpose database, DNS can store records for other types of data for either automatic lookups, such as DNSSEC records, or for human queries such as responsible person (RP) records.
As a general purpose database, the DNS has also been used in combating unsolicited email (spam) by storing a real-time blackhole list.
The Internet maintains two principal namespaces, the domain name hierarchy The Domain Name System maintains the domain name hierarchy and provides translation services between it and the address spaces.
Internet name servers and a communication protocol implement the Domain Name System.
Network administrators may delegate authority over sub-domains of their allocated name space to other name servers.It defines the DNS protocol, a detailed specification of the data structures and data communication exchanges used in the DNS, as part of the Internet Protocol Suite.Historically, other directory services preceding DNS were not scalable to large or global directories as they were originally based on text files, prominently the hosts file.For example, the domain name to the addresses 126.96.36.199 (IPv4) and 260:6d:26bf:1497:aa7 (IPv6).Unlike a phone book, DNS can be quickly updated, allowing a service's location on the network to change without affecting the end users, who continue to use the same hostname.