# AWS Resource Groups and Tagging endpoints and quotas
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To connect programmatically to an AWS service, you use an endpoint. AWS services offer the following endpoint types in some or all of the AWS Regions that the service supports: IPv4 endpoints, dual-stack endpoints, and FIPS endpoints. Some services provide global endpoints. For more information, see [AWS service endpoints](rande.md).

Service quotas, also referred to as limits, are the maximum number of service resources or operations for your AWS account. For more information, see [AWS service quotas](aws_service_limits.md).

The following are the service endpoints and service quotas for this service.

## AWS Resource Groups
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### Service endpoints
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[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/general/latest/gr/arg.html)

### Service quotas for Resource Groups
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[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/general/latest/gr/arg.html)

## Tagging
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### Service endpoints for AWS Resource Groups Tagging API
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[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/general/latest/gr/arg.html)

### Service quotas for Tagging (Tag Editor and Resource Groups Tagging API)
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| Name | Default | 
| --- | --- | 
|  Tags attached per resource  |  50 user created tags (AWS created tags don't count against this limit)  | 
|  Tag key name  |  Minimum of 1, maximum 128 Unicode characters in UTF-8. Allowed characters include: letters, numbers, spaces, and the following characters: `_ . : / = + - @` Key names can't begin with `aws:` because that is reserved.  Some AWS services have some additional character or length restrictions. For details, see the documentation for the specific service.   | 
|  Tag values  |  Minimum of 0, maximum of 256 Unicode characters in UTF-8. Allowed characters include: letters, numbers, spaces, and the following characters: `_ . : / = + - @`  Some AWS services have some additional character or length restrictions. For details, see the documentation for the specific service.   | 
|  Rate of calling the [GetResources](https://docs.aws.amazon.com/resourcegroupstagging/latest/APIReference/API_GetResources.html) API operation  |  Maximum of 15 calls per second  | 
|  Rate of calling the following API operations: [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/general/latest/gr/arg.html)  |  Maximum of 5 calls per second  | 

**Note**  
These limits are currently not adjustable using the [Service Quotas console](https://console.aws.amazon.com/servicequotas/home/services/resource-groups/quotas). Contact AWS Support.