AWS CLI command to find the Quota limit

You could use the AWS CLI to check the current limit for IAM Server certificates by running the AWS CLI command -

$ aws service-quotas get-service-quota --service-code iam --quota-code L-BF35879D --region us-east-1

==============
{
  "Quota": {
    "ServiceCode": "iam",
    "ServiceName": "AWS Identity and Access Management (IAM)",
    "QuotaArn": "arn:aws:servicequotas::895006963947:iam/L-BF35879D",
    "QuotaCode": "L-BF35879D",
    "QuotaName": "Server certificates per account",
    "Value": "55",
    "Unit": "None",
    "Adjustable": "true",
    "GlobalQuota": "true",
    "UsageMetric": null,
    "Period": null,
    "ErrorReason": null
  }
}
==================

Here, you could see the Value as 55.

b. You could use the AWS Console to see this details.

Please make sure to select the region as 'us-east-1' regions.

Then please navigate to AWS services > AWS Identity and Access Management (IAM) > Server certificates per account. 

Here, you could see the list.

Query 2 - Where you could see how many certificates are being used.

Answer  - You could run the following CLI command to list the IAM certificates in your account - 

$ aws iam list-server-certificates

I hope the above information is helpful. In case of any other query or concern, please feel free to update the case and I will be glad to assist you further.

References:

https://docs.aws.amazon.com/cli/latest/reference/service-quotas/get-service-quota.html#examples

[2] https://docs.aws.amazon.com/cli/latest/reference/iam/list-server-certificates.html#examples