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Amazon Route 53
Developer Guide (API Version 2013-04-01)

Limits

Amazon Route 53 API requests and entities are subject to the following limits.

Limits on API Requests

Amazon Route 53 API requests are subject to the following limits.

Number of Elements and Characters in ChangeResourceRecordSets Requests

ResourceRecord elements

A request cannot contain more than 1000 ResourceRecord elements. When the value of the Action element is UPSERT, each ResourceRecord element is counted twice.

Maximum number of characters

The sum of the number of characters (including spaces) in all Value elements in a request cannot exceed 32,000 characters. When the value of the Action element is UPSERT, each character in a Value element is counted twice.

Frequency of Amazon Route 53 API Requests

All requests

Five requests per second per AWS account. If you submit more than five requests per second, Amazon Route 53 returns an HTTP 400 error (Bad request). The response header also includes a Code element with a value of Throttling and a Message element with a value of Rate exceeded.

ChangeResourceRecordSets requests

If Amazon Route 53 can't process a request before the next request arrives, it will reject subsequent requests for the same hosted zone and return an HTTP 400 error (Bad request). The response header also includes a Code element with a value of PriorRequestNotComplete and a Message element with a value of The request was rejected because Route 53 was still processing a prior request.

CreateHealthCheck requests

You can submit a maximum of 1000 CreateHealthCheck requests in a 24-hour period.

Limits on Entities

Amazon Route 53 entities are subject to the following limits.

Entity Limit

Hosted zones

500 per AWS account

Request a higher limit.

Domains

50 per AWS account

Request a higher limit.

Reusable delegation sets

100 per AWS account

Request a higher limit.

Hosted zones that can use the same reusable delegation set

100

Request a higher limit.

Amazon VPCs that you can associate with a private hosted zone

100

Request a higher limit.

Authorizations that you can create so you can associate Amazon VPCs that were created by one account with a hosted zone that was created by another account

100

Resource record sets

10,000 per hosted zone

Request a higher limit.

For a limit greater than 10,000 resource record sets in a hosted zone, an additional charge applies.

Weighted and geolocation resource record sets

100 resource record sets that have the same name and type

Resource records

100 per resource record set

Health checks

50 active health checks per AWS account

Request a higher limit.

Traffic policies

50 per AWS account

Request a higher limit.

Policy records (referred to as "policy instances" in the Amazon Route 53 API, AWS SDKs, AWS Command Line Interface, and AWS Tools for Windows PowerShell)

5 per AWS account

Request a higher limit.