DNS A records associate hostnames to IP addresses of hosts (computers) on the Internet. The hostname can be a root domain (such as example.com), or a sub-domain (like www.example.com). Each hostname can also have more than one DNS A record, thus acting as a DNS level load-balancer for the hosts.
DNS A record requires three inputs:
DNS A records can map IPv4 addresses only, whereas the DNS AAAA records map IPv6 addresses. For example, "18.104.22.168" is the IPv4 address of "example.com" hosted using a DNS A record. Also, certain IPv4 addresses like private addresses (such as 0.0.0.0) cannot be hosted using DNS A records, but only those address ranges accessible on the Internet.
DNS records are hosted on the Internet through DNS hosting services. If you are using Slickalpha DNS, check this related guide to learn how to add a DNS record on your Slickalpha account.
DNS records can be queried directly on your system terminal using the dig command. To check your DNS A records on the browser, try our free DNS Lookup tool.
DNS A record is essential in mapping domains and sub-domains to IP addresses of host computers. The most common use of DNS A record is web browsing. When the hostname is entered on a web browser, the browser client uses the DNS A record to get the IP address of the host from public DNS resolvers. The browser then connects the host server using that IP address to fetch web content. DNS lists also use DNS A records to provide domain-related information.