A Record

An A record maps a domain name to an IP address. This is the most basic function of DNS. There are three values that must be specified for an A record:

Name - The domain name. For example, dnsuniversity.com is the name of an A record. It is also the host of the domain

TTL - The time of live, or amount of time, in seconds, the record will be stored in the cache of a resolving name server. For example, 1800 is a standard TTL.

IP - Indicates the IP which this domain is mapped to. For example, 192.168.1.2.

Some DNS providers allow multiple IPs per host for routing, which is called Round Robin.

A records are used for IPv4 addresses. IPv6 addresses use AAAA Records.