|DNS nodes||3 Node||7 Node|
|Minimum TTL (second)||600||60|
|Intelligent DNS resolution||Continent or Country||
China Unicom, China Telecom, China Mobile,
CERNET, and outside China, Continent or Country
|Number of URL forwarding records||2||10|
|Automatically switch when downtime||None||Support multiple switching modes|
|Customized solutions||None||Support customization|
|Buy Now||Buy Now|
Delivers SLA-guaranteed service availability of 99.99% to ensure that your websites or applications run stably.
Processes up to hundreds of millions of DNS queries per second and protects your websites or applications against DNS attacks.
Returns IP addresses based on your geographical locations. Resolution lines cover 6 major Internet Service Providers (ISPs) and their provincial branches in China, 6 continents and 88 countries and regions outside China.
Provides 7 DNS cluster nodes worldwide and the DNS smart acceleration service to allow you to access the closest nodes with low latency.
Supports the following types of DNS records: A, AAAA, CAA, MX, CNAME, TXT, NS, and SRV.
URL Forwarding (302 Redirect)
Supports up to 10 implicit or explicit URL forwarding records.
Supports independent authorization management for second-level and third-level subdomains. The number of DNS records for subdomains is unlimited.
Allows you to set the minimum time to live (TTL) to 1 second for the changes to DNS records to take effect.
Supports up to100 IP addresses that are used for load balancing in a single line of a domain name.
Supports A and CNAME records.
Collects statistics of DNS queries for primary domain names and subdomain names.
Supports China Unicom, China Telecom, China Mobile, CERNET, Dr. Peng Telecom & Media Group, and China Broadcasting Network.
Subdivided ISP Lines
Supports 6 major ISPs, which cover 31 provinces.
Supports Central China, North China, Northeast China, East China, South China, Southwest China, Northwest China.
Subdivided Region Lines
Supports 7 regions in China, which cover 31 provinces.
Lines Outside China
Supports Oceania, Asia, Europe, North America, South America, and Africa.
Subdivided Lines Outside China
Supports 6 continents, which cover 88 countries and regions.
Supports intelligent DNS resolution for lines based on custom IP address ranges.
DNS Query Attacks
Supports real-time attack detection and abnormal traffic handling, and processes up to hundreds of millions of DNS queries per second.
Disaster Recovery and Backup
Secondary DNS provides disaster recovery and backup for your DNS. If your DNS server fails, the secondary DNS server can continue to provide DNS services to ensure that your business system is still accessible.
To achieve load balancing, you can use the secondary DNS server and your DNS server to provide DNS services at the same time. To protect your DNS server, you can use only the secondary DNS server to provide DNS services.
Secure and Effective Resolution
Secondary DNS provides efficient DNS services based on the global node distribution of Alibaba Cloud DNS, and protects your websites or applications against DDoS attacks.