When you register a domain name the authority for management of that domain is delegated to you via an ‘authoritative’ DNS (normally at your ISP).
Zone files organize the zone records for domain names in a DNS server. Every domain name has a zone file, and each zone file contains zone records. These files, editable in any plain text editor, hold the DNS information linking domain names to IP addresses. Zone files usually contain several different zone records. (normally at your ISP).
The most common records contained in a zone file are start of authority (SOA), name server, mail exchanger, host, and CNAME.
For any kind of change or modification like NS/MX/PTR/A record updating in Zone file, it will take 48hr to propagate
An A-record is an entry in your DNS zone file that maps each domain name (e.g. yourdomain.com) to an IP address. In other words, the A-record specifies the IP address to which the user would be sent for each domain. This means that you can have different subdomains of your website resolving to different IP addresses, which could be useful if they are hosted on different servers.
- Example A-record for yourdomain.com:
- Host Name: www – IP Address: 220.127.116.11
- This would cause www.yourdomain.com to resolve to the IP address 18.104.22.168.