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	Where to Use	Usage
A	Public and private zones	Maps domains to IPv4 addresses.
CNAME	Public and private zones	Maps one domain name to another or multiple domain names to one domain name.
MX	Public and private zones	Maps domain names to email servers.
AAAA	Public and private zones	Maps domain names to IPv6 addresses.
TXT	Public and private zones	Specifies text records. 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	Public and private zones	Records servers providing specific services.
NS	Public and private zones	Delegates subdomains to other name servers. For public zones, an NS record set is automatically created, and you can add NS records for subdomains. For private zones, an NS record set is automatically created, and you cannot add other NS record sets.
SOA	Public and private zones	Specifies the master authoritative DNS server for a domain name. The SOA record set is created by the system and cannot be added manually.
CAA	Public zone	Grants certificate issuing permissions to CAs. CAA record sets can be used to prevent the issuance of unauthorized HTTPS certificates.
PTR	Private zone	Maps IP addresses to domain names.

Record sets are used in following scenarios:

Website domain name resolution
A and AAAA record sets are usually used to build websites. They translate domain names into IP addresses.

Figure 1 Website domain name resolution
Private domain name resolution
On a private network, A and AAAA record sets translate private domain names into private IP addresses.

Figure 2 Private domain name resolution
Email domain name resolution
MX, CNAME, and TXT record sets are usually used for email services.

Figure 3 Email domain name resolution
Reverse resolution on a private network
You can use PTR records to translate private IP addresses into private domain names.

Figure 4 Reverse resolution on a private network

For details, see Overview.

Record Set