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    Alibaba Cloud DNS:Limits

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    Alibaba Cloud DNS:Limits

    Last Updated:Jun 03, 2026

    Lists the quotas and constraints for PrivateZone zones, DNS records, VPC associations, QPS throttling, and forwarding rules.

    Built-in authoritative limits

    Limit item

    Limit threshold

    Description

    Number of domains (zones)

    500

    Each account supports up to 500 zones.

    Number of VPCs that you can associate with a zone

    100

    Each zone supports up to 100 associated VPCs.

    Number of accounts from which you can associate VPCs

    200

    Supports VPCs from up to 200 Alibaba Cloud accounts.

    Number of DNS records

    100,000 (Standard zone)

    Each zone supports up to 100,000 DNS records in both standard and accelerated zones. To increase this quota, submit a ticket.

    100,000 (Accelerated zone)

    Weight policy

    Not supported (Standard zone)

    When multiple IP addresses are configured for the same host record, responses return all IPs based on preset weights to distribute traffic across servers for load balancing.

    Supported (Accelerated zone)

    Custom internal line resolution

    Not supported (Standard zone)

    Customize the built-in authoritative DNS to return specific IP addresses for requests from designated internal IP segments. Limits.

    Supported (Accelerated zone)

    Total resolution requests from a single ECS instance in a VPC

    5,000 per second

    Each ECS instance supports up to 5,000 DNS requests per second. Exceeding this limit may trigger throttling, and the 99.99% SLA availability may not be guaranteed.

    Total resolution requests from all ECS instances in a VPC

    No limit

    No limit on aggregate resolution requests across all ECS instances in a VPC.

    External recursive resolution requests from a single ECS instance in a VPC

    600 per second

    Each ECS instance supports up to 600 external recursive requests per second. Exceeding this limit may trigger throttling.

    Total external recursive resolution requests from all ECS instances in a VPC

    5,000 per second

    The aggregate limit for external recursive requests across a single VPC is 5,000 per second. Exceeding this limit may trigger throttling.

    Batch operations

    Limits

    Supports batch deletion of domains, import of DNS records, and pausing/enabling DNS records.

    Inbound endpoint

    Limits

    Allocate custom inbound endpoints to avoid address conflicts with 100.100.2.136/100.100.2.138 when accessing cloud DNS from outside the cloud.

    Wildcard DNS record

    -

    Wildcard DNS records are supported regardless of the recursive resolution proxy setting for subdomains.
    Warning

    The QPS throttling parameters for various query requests within a VPC are global indicators and cannot be adjusted.

    Domain (zone) format limits

    • Maximum length: 200 characters. Minimum level: 1.

      Note

      Levels are separated by dots. a = level 1, a.b = level 2, a.b.c = level 3, and so on.

    • Maximum domain (zone) level: 16

    • Maximum host record level: 20

      Note

      The maximum FQDN level is therefore 36 (16 + 20).

    • Top-level domain: 2-63 characters. Other levels: 1-63 characters. Allowed characters: hyphens, underscores, numbers, and lowercase letters. Must start with a number or lowercase letter.

      Note

      In www.aliyun.com: com allows 2-63 characters, aliyun allows 1-63 characters, and www allows 1-63 characters.

    • Reverse lookup domains end with .in-addr.arpa

    Forwarding limits

    Limit item

    Limit threshold

    Description

    Number of endpoints per user

    20

    Maximum 20 endpoints per user.

    Number of forwarding rules per user

    1000

    Maximum 1,000 forwarding rules per user.

    Number of outbound endpoint IPs

    Minimum: 2, Maximum: 6

    Each outbound endpoint requires 2-6 IP addresses.

    Number of target IPs for forwarding rules

    6

    Maximum 6 target IP addresses per forwarding rule.

    Number of VPCs that can be bound to a forwarding rule

    100

    Maximum 100 VPCs per forwarding rule.

    Domain level for forwarding domains (zones)

    16

    Maximum 16 domain levels. Exceeding this limit returns an invalid zone name error.
    Important

    Domain query requests from outbound endpoints are considered external DNS query requests and are subject to the limit on external recursive resolution requests from a single ECS instance in a VPC, which is 600 per second.