Record Set Types and Configuration Rules

Record Set Types

Table 1 describes the record set types.

Record set types in public zones: A, CNAME, MX, AAAA, TXT, SRV, NS, SOA, CAA, and PTR
Record set types in private zones: A, CNAME, MX, AAAA, TXT, SRV, SOA, and PTR

**Table 1** Record set types
Record Set Type	Description	Value	Example
A	Maps domains to IPv4 addresses.	IPv4 addresses mapped to the domain name You can enter a maximum of 50 record values, each on a separate line.	192.168.12.2 192.168.12.3
CNAME	Maps one domain name to another or multiple domain names to one domain name.	Domain name alias. You can enter only one domain name.	www.example.com
MX	Maps domain names to email servers.	Email server address You can enter a maximum of 50 record values, each on a separate line. The format is [priority][mail server host name]. Configuration rules: priority: priority for an email server to receive emails. A smaller value indicates a higher priority. mail server host name: domain name provided by the email service provider	10 mailserver.example.com. 20 mailserver2.example.com.
AAAA	Maps domain names to IPv6 addresses.	IPv6 addresses mapped to the domain name You can enter a maximum of 50 record values, each on a separate line.	ff03:0db8:85a3:0:0:8a2e:0370:7334
TXT	Creates text records for domain names. It is 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.	Text content Configuration rules: Text record values must be enclosed in double quotation marks. One or more text record values are supported, each on a separate line. A maximum of 50 text record values can be entered. A single text record value can contain multiple character strings, each of which is double quoted and separated from others using a space. One character string cannot exceed 255 characters. A value must not exceed 4096 characters. The value cannot be left blank. The text cannot contain a backslash (\).	Single text record: "aaa" Multiple text records: "bbb" "ccc" A text record that contains multiple strings: "ddd" "eee" "fff" Text record in SPF format: "v=spf1 a mx -all" This value indicates that only IP addresses in the A and MX record sets are allowed to send emails using this domain name.
SRV	Records servers providing specific services.	Server address You can enter a maximum of 50 record values, each on a separate line. The value format is [priority] [weight] [port number] [server address]. Configuration rules: The priority, weight, and port number range from 0 to 65535. A smaller priority value indicates a higher priority. A larger weight value indicates a larger weight. The server address is the domain name of the target server. Ensure that the domain name can be resolved. NOTE: The system checks the priority values first. If the priority values are the same, the system will check the weight values.	2 1 2355 example_server.test.com
NS	Delegates subdomains to other name servers. For public zones, an NS record set is automatically created, and you can add NS record sets for subdomains. For private zones, an NS record set is automatically created, and you cannot add other NS record sets.	DNS server address You can enter a maximum of 50 record values, each on a separate line.	ns1.example.net ns2.example.net
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.	This type of record set is created by default and cannot be added manually.	This type of record set is created by default and cannot be added manually.
CAA	Grants certificate issuing permissions to CAs. CAA record sets can prevent the issuance of unauthorized HTTPS certificates.	CA to be authorized to issue certificates for a domain name or its subdomains You can enter a maximum of 50 record values, each on a separate line. The format is [flag] [tag] [value]. Configuration rules: flag: certificate authority (CA) identifier, which is an unsigned character ranging from 0 to 255. Usually, the value is set to 0. tag: You can enter 1 to 15 characters, including only letters and digits. The tag can be one of the following: issue: authorizes CAs to issue all types of certificates. issuewild: authorizes CAs to issue wildcard certificates. iodef: requests notifications once CAs receive invalid certificate requests. value: authorized CA or email address/URL required for notification once the CA receives invalid certificate requests, depending on the value of tag. The value must be enclosed in quotation marks ("") and can contain a maximum of 255 characters, including letters, digits, spaces, and special characters -#*?&_~=:;.@+^/!%	0 issue "ca.abc.com" 0 issuewild "ca.def.com" 0 iodef "mailto:admin@domain.com" 0 iodef "http:// domain.com/log/"
PTR	Maps IP addresses to domain names.	Private domain name mapped to the private IP address. You can enter only one domain name.	www.example.com