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The answer is in this documentation article: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-byoip.html#byoip-requirements
You can bring a total of five BYOIP IPv4 and IPv6 address ranges per AWS Region to your AWS account. You cannot adjust the quotas for BYOIP CIDRs using the Service Quotas console, but you can request a quota increase by contacting the AWS Support Center as described in AWS service quotas (https://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html) in the AWS General Reference.
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Thank you for your answer. This information is indeed in the documentation. However, I'm not able to find this specific limit quota on the quota increase request form. The closest I found is "CIDRs per VPC", which is not what I'm looking for. Do you know where this specific limit is?
@Rafael It isn't listed in the selections, so I'd suggest leaving the exact quota selection empty (so that the request doesn't get misconstrued as relating to a different quota) or if the form doesn't allow you to do that, simply open a free-form support ticket and explain what is needed. The request should get routed to a human agent.
@Leo K, thank you. I had already done that. The support team is not able to identify the correct limit quota and, as suggested by them, I'm now in contact with the sales team for advice on which limit quota is this. I hoped this would be a little easier, but it seems the increase of this limit is not a very common request. Thank you for your help.