DNS, or Domain Name System, is a system that maps domain names (such as www.example.com) to IP addresses (such as 192.0.2.1). There are several types of DNS mappings that can be used to accomplish this:
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1. A (Address) record:
This is the most basic type of DNS record, and is used to map a domain name to an IP address. For example, an A record for “example.com” might map it to the IP address “192.0.2.1”.
2. AAAA (Quad-A) record:
This is similar to an A record, but is used to map a domain name to an IPv6 address.
3. CNAME (Canonical Name) record:
This type of record is used to create an alias for a domain name. For example, you might use a CNAME record to map “www.example.com” to “example.com”, so that visitors to either domain will be directed to the same website.
4. ALIAS record:
This is similar to a CNAME record, but it provides a way to alias a domain name to another name at the DNS level, rather than redirecting the request to the target domain name, as CNAME does.
5. NS (Name Server) record:
The NS record is used to specify the authoritative name servers for a domain. It tells other DNS servers where to look for the DNS records for a specific domain.
6. MX:
The MX record is used to specify the mail servers for a domain. It tells other mail servers where to deliver email messages for a specific domain.
7. SOA:
The SOA record is the start of authority record, it provides information about the domain name, including the primary name server and the email of the domain administrator. It is also used to specify the serial number and the refresh, retry, and expire times for the domain’s DNS records.
These are some of the common types of DNS records, but there are many others that can be used for different purposes.
