You can bring part or all of your public IPv4 address range or IPv6 address range from your on-premises network to your AWS account. You continue to own the address range, but AWS advertises it on the internet by default. After you bring the address range to AWS, it appears in your account as an address pool.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-byoip.html