Record Set

A record set is a collection of resource records that belong to the same domain name. A record set defines DNS record types and values.

If you have created a zone on the DNS console, you can create record sets to expand the domain name or record its detailed information.

Table 1 describes the record set types and their application scenarios.

**Table 1** Record set usages
Type	Usage
A	Maps domains to IPv4 addresses.
CNAME	Maps one domain name to another or multiple domain names to one domain name.
MX	Maps domain names to email servers.
AAAA	Maps domain names to IPv6 addresses.
TXT	Creates text records for domain names. TXT record sets are usually used in the following scenarios: To record DKIM public keys to prevent email fraud. To record the identity of domain name owners to facilitate domain name retrieval.
SRV	Records servers providing specific services.
NS	Delegates subdomains to other name servers. This type of record sets is created by default and cannot be manually added.
SOA	Specifies the master authoritative DNS server for a domain name. The SOA record set is created by the system and cannot be added manually.
PTR	Maps IP addresses to domain names.

Record sets are used in following scenarios:

Private domain name resolution
On a private network, A and AAAA record sets translate private domain names into private IP addresses.

Figure 1 Private domain name resolution
Reverse resolution on a private network
PTR records translate private IP addresses into private domain names.

Figure 2 Reverse resolution on a private network