Types of DNS records

Important categories of data stored in the DNS include the following:

  • An A record or address record maps a hostname to a IP address.
  • A NAME record or canonical name record makes one domain name an alias of another. The aliased domain gets all the subdomains and DNS records of the original.
  • An MX record or mail exchange record maps a domain name to a list of mail exchange servers for that domain.
  • An NS record or name server record maps a domain name to a list of DNS servers authoritative for that domain. Delegations depend on NS records.
  • An SOA record or start of authority record specifies the DNS server providing authoritative information about an Internet domain, the email of the domain administrator, the domain serial number, and several timers relating to refreshing the zone.
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