Amazon Route 53 is a highly available and scalable Domain Name System (DNS) web service.
Just in case – Amazon EC2
I use this script https://github.com/konstantinvlasenko/cloud/blob/master/Register-CNAME.ps1 to provide meaningful names for them.
Simple usage:

$config = @{ DomainName = 'mylab.com' }
$name = "www.$($config.DomainName)"
# get instances
$instance = (Get-EC2Instance $InstanceId).RunningInstance
# update R53
.\Register-CNAME.ps1 $config $name $instance.PublicIpAddress

Advanced usage (register in another account; registering A record):

$config = @{ DomainName = 'mylab.com'; AssumeRoles = @{ R53 = @{ ARN = 'arn:aws:iam::600021112340:role/Route53'; SessionName = 'Friends' } }; }
$name = "www.$($config.DomainName)"
# get instances
$instance = (Get-EC2Instance $InstanceId).RunningInstance
# update R53
.\Register-CNAME.ps1 $config $name $instance.PublicIpAddress 'A'