About DNS

DNS (Domain Name System) translates human-readable domain names (eg boxcorea.com) into machine-readable IP addresses (eg 192.0.1.100).

The Internet's DNS system functions like a representative phone book by managing the number of names and numbers. DNS servers translate requests for names into IP addresses to determine which server to talk end users to when they type the domain name into their web browser. This request is called a query.

In Unix shell, commands such as nslookup and dig are provided, and in Windows, you can use the nslookup command to search.

DNS Record type

A (Address Mapping records) - IPv4 address for host
AAAA (IP Version Mapping records) - IPv6 address for host
NS(Name Server) - Name servers that manage domains
SOA (Start of Authority) - Specifies key information about the DNS zone, such as the primary name server, domain administrator's e-mail, and domain serial number.
MX (mail exchanger) - Specify the mail server for the domain
CNAME (Canonical NAME) - Specifies an alias for the host