Public Authoritative DNS Resolution is available in one free edition and three paid editions. This topic compares the free edition with the paid editions.
Edition comparison
The following table describes the differences between the free edition and paid editions of Public Authoritative DNS Resolution.
We recommend that you purchase the Domain Name System (DNS) protection feature to increase the maximum number of DNS requests per second. This avoids DNS resolution failures as much as possible.
For scenarios where DNS records need to be frequently changed in batches, we recommend that you use the DNS data backup feature to ensure quick restoration of DNS records in case of errors.
The number of domain names bound to a Public Authoritative DNS Resolution instance is the number of primary domain names that are bound to the Public Authoritative DNS Resolution instance. Subdomain names that are independently hosted by Public Authoritative DNS Resolution are also counted into such primary domain names.
Feature | Free Edition | Personal Edition | Enterprise Standard Edition | Enterprise Ultimate Edition |
Applicable website | Business scenario - test | Websites of individual users and small and micro-sized enterprises. These websites have requirements for service level agreement (SLA) and have no special requirements for DNS performance, such as the effective time of DNS settings, DNS record backup, and intelligent DNS resolution. | Websites or services of large and medium-sized enterprises. These websites have higher requirements for DNS performance, such as the effective time of DNS settings, SLA, and intelligent DNS resolution. | Websites of Internet technology enterprises, financial institutions, and multinational enterprises. These websites have the highest requirements for DNS performance, such as the effective time of DNS settings and custom services. |
SLA-guaranteed availability | Not supported. After-sales support is not provided. | Monthly availability at 100% | Monthly availability at 100% | Monthly availability at 100% |
Maximum number of DNS nodes | 4 in the Chinese mainland | 13 in the Chinese mainland 13 outside the Chinese mainland | 13 in the Chinese mainland 13 outside the Chinese mainland | 13 in the Chinese mainland 13 outside the Chinese mainland |
Number of subdomain hosting levels | 16 | 16 | 16 | 16 |
Maximum number of DNS records for a primary domain name | 100,000 | 100,000 | 100,000 | 100,000. If you want to add more subdomain names, submit a ticket to apply for a larger upper limit. |
Maximum number of subdomain levels | 10 | 20 | 20 | 20 |
Minimum TTL period (seconds) | 600 | 600 | 60 | 1 |
Intelligent DNS resolution | Lines of China Unicom, China Telecom, China Mobile, China Education and Research Network (CERNET), Internet service providers (ISPs) outside the Chinese mainland, and search engines in the Chinese mainland | Lines of China Unicom, China Telecom, China Mobile, Dr. Peng Group, CERNET, China Broadnet (CBN), ISPs outside the Chinese mainland, and search engines in the Chinese mainland | Lines of cloud service providers, provincial lines of China Unicom, China Telecom, China Mobile, Dr. Peng Group, CERNET, and CBN, lines of ISPs outside the Chinese mainland (continents, countries, or regions), provincial lines of ISPs in the Chinese mainland, and lines of search engines in and outside the Chinese mainland | All fixed intelligent resolution lines (Resolution of custom IP address ranges is supported.) |
Line type switching (ISP lines and regional lines) | Not supported | Not supported | Supported | Supported |
Maximum number of URL forwarding records | 2 | 5 | 10 | 10 |
Weight configuration (A, CNAME, and AAAA records) | Supported | Supported | Supported | Supported |
Maximum number of IP addresses that are used for load balancing in a single line of a domain name | 10 | 100 | 100 | 100 |
Statistics on the number of requests (accurate to subdomains) | Not supported | Supported | Supported | Supported |
IPv6 DNS | Supported | Supported | Supported | Supported |
Secondary DNS | Not supported | Not supported | Not supported | Supported |
DNS record backup | Not supported | Not supported | Supported (backup by day, restoration with only a few clicks) | Supported (backup by hour, restoration with only a few clicks) |
DNS Security Extensions (DNSSEC) | Not supported | Supported | Supported | Supported |
Maximum number of domain names that can be bound to an Public Authoritative DNS Resolution instance | - | 1 by default, the maximum is 100,000 | 1 by default, the maximum is 100,000 | 1 by default, the maximum is 100,000 |
Maximum number of DNS queries per second | 20,000 | 200,000 | 200,000 | 200,000 |
DNS protection
Public Authoritative DNS Resolution Free Edition does not support DNS protection. The following table describes two protection levels.
Protection level | Basic DNS attack defense | Advanced DNS attack defense |
Service scope | Public Authoritative DNS Resolution provides basic protection against DNS attacks for domain names bound to Public Authoritative DNS Resolution instances. A maximum of 10 million requests can be handled per second for each domain name. | Public Authoritative DNS Resolution provides advanced protection against DNS attacks for domain names bound to Public Authoritative DNS Resolution instances. More than 100 million requests can be handled per second for each domain name to ensure normal DNS resolution under DNS flood attacks. |
Global nodes of Public Authoritative DNS Resolution
Public Authoritative DNS Resolution is available in the following nodes: US (Virginia), US (Silicon Valley), Indonesia (Jakarta), Malaysia (Kuala Lumpur), Singapore, Japan (Tokyo), Saudi Arabia (Riyadh), UAE (Dubai), Germany (Frankfurt), UK (London), Thailand (Bangkok), South Korea (Seoul), Philippines (Manila), China (Hong Kong), China (Beijing), China (Shanghai), China (Shenzhen), China (Hangzhou), China (Chengdu), China (Qingdao), China (Nanjing), China (Dalian), China (Xi'an), China (Tianjing), China (Taiyuan), and China (Zhengzhou).
The number of nodes may be increased with the development of Alibaba Cloud infrastructures and the proceding nodes do not guarantee any availability for the SLA.
Number of domain names bound to a Public Authoritative DNS Resolution instance
By default, each Public Authoritative DNS Resolution instance can be bound to one domain name, such as example.com. If you want to bind more domain names such as example.cn and example.net to a Public Authoritative DNS Resolution instance, you can increase the number of domain names on the buy page when you purchase the instance. A maximum of 100,000 domain names are supported.