A Records and Hosts Records
The bread and butter behind the DNS system is the A record. The A record (address record, also known as the host record) maps a domain name to an IP address on the Internet. Please review the DNS Primer for more help on DNS records.
Click on DNS|DNS Records|A Records
in the top navigation bar
To add A records to your account:
Enter a subdomain name (this can be blank)
Select the domain from the drop-down list
Enter the IP address for the given subdomain.domain combination