An address record (that is, A record) maps a hostname to an IPv4 address.
An IPv6 address record (that is, AAAA record) maps a hostname to an IPv6 address.
A canonical name record (that is, CNAME record) is an alias of an existing record, thus allowing multiple DNS records to map to the same IP address.
A mail exchange record (that is, MX record) maps a domain name to an e-mail (or message transfer agent) server for that domain.
A pointer record (that is, PTR record) points to a canonical name. A PTR record is commonly used when performing a reverse DNS lookup, which is a process used to determine what domain name is associated with a known IP address.
A start of authority record (that is, SOA record) provides authoritative information about a DNS zone, such as e-mail contact information for the zone's administrator, the zone's primary name server, and various refresh timers.
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