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dns-limits.md

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author greg-lindsay
ms.service azure-resource-manager
ms.topic include
ms.date 10/08/2024
ms.author greglin

Public DNS

Public DNS zones
Resource Limit
Public DNS zones per subscription 250 1
Record sets per public DNS zone 10,000 1
Records per record set in public DNS zone 20 1
TXT Records per record set in public DNS zone 400
Number of Alias records for a single Azure resource 50

1If you need to increase these quota limits, contact Azure Support.

Public DNS zone operations
Operation Limit (per zone)
Create 40/min
Delete 40/min
Get 1000/min
List 60/min
List By Resource Group 60/min (per resource group)
Update 40/min
Public DNS resource record operations
Operation Limit (per zone)
Create 200/min
Delete 200/min
Get 2000/min
List By DNS Zone 60/min
List By Type 60/min
Update 200/min

Private DNS

Private DNS zones
Resource Limit
Private DNS zones per subscription 1000
Record sets per private DNS zone 25000
Records per record set for private DNS zones 20
Virtual Network Links per private DNS zone 1000
Virtual Networks Links per private DNS zones with autoregistration enabled 100
Number of private DNS zones a virtual network can get linked to with autoregistration enabled 1
Number of private DNS zones a virtual network can get linked 1000
Private DNS zone operations
Operation Limit (per subscription)
Create 40/min
Delete 40/min
Get 200/min (per zone)
List by subscription 60/min
List by resource group 100/min (per resource group)
Update 40/min
Private DNS resource record operations
Operation Limit (per zone)
Create 60/min
Delete 60/min
Get 200/min
List 100/min
Update 60/min

Virtual network links operations

Operation Limit (per zone)
Create 60/min
Delete 60/min
Get 100/min
List by virtual network 20/min
Update 60/min

Azure-provided DNS resolver VM limits

Resource Limit
Number of DNS queries a virtual machine can send to Azure DNS resolver, per second 1000 1
Maximum number of DNS queries queued (pending response) per virtual machine 200 1

1These limits are applied to every individual virtual machine and not at the virtual network level. DNS queries exceeding these limits are dropped. These limits apply to the default Azure resolver, not the DNS private resolver.

DNS Private Resolver1

Resource Limit
DNS private resolvers per subscription 15
DNS private resolvers per virtual network 1
Inbound endpoints per DNS private resolver 5
Outbound endpoints per DNS private resolver 5
Forwarding rules per DNS forwarding ruleset 1000
Virtual network links per DNS forwarding ruleset 500
DNS forwarding ruleset linked to a virtual network 1
Outbound endpoints per DNS forwarding ruleset 2
DNS forwarding rulesets per outbound endpoint 2
Target DNS servers per forwarding rule 6
QPS per endpoint 10,000

1Different limits might be enforced by the Azure portal until the portal is updated. Use PowerShell to provision elements up to the most current limits.