What are A Records?
A records map an FQDN (fully qualified domain name) to an IPv4 address and are the most used record type in DNS. A records can be configured in a domain for a specific host such as www.example.com or for the root record such as example.com.
Note that the @ symbol refers to the root of the domain, which can be reflected within your zone file as a blank name value.
1. Select your Domain
A. Select Managed DNS
B. Select Domains from the dropdown 
C. Select the domain you want to add an A record too.
2. Select A Record
Under the A records section, click the (+) icon to add a record.
3. Enter Record Values
A. Name: The hostname for the record. To set the record for the root domain (@), leave this field blank.
B. TTL: Time to Live, measured in seconds, determines how long the record is cached in resolvers. For more information on best practices for TTLs, click here.
C. Record Mode: The Record Mode is how you enable settings like Failover, Record Pools, or Round Robin with Failover. You can read more about these settings here.
D. Geo Proximity: You can select a Geo Proximity rule to apply to the record, for more information on Geo Proximity, click here.
E. IP Filter: You can select an IP Filter to apply to the record, for more information on IP Filters, click here.
F. Disable Record: Information on the NX Domain feature can be found in the Disabling a Record tutorial.
G. IP: The IPv4 address of your server.
H. Notes: Add a helpful note with keywords so you can search for your records later.
I. Save and Close/Continue: Save and Close to finish entering A records or Save and Continue to add more records of the same type.
