Unfortunately, we are currently experiencing bot attacks on our domain search page, and our team has had to implement the captcha requirements to prevent these attacks. Our team are relaxing the restrictions when and where possible, and are closely monitoring the situation so they can make any changes as soon as they are able to. Currently, you should be able to perform 4 searches in one minute whilst logged in before seeing the captcha request, and once that has been entered correctly you shouldn't be asked to complete another captcha for 6 hours. If you are seeing the captcha more frequently please let us know by DM, including your Dynadot username, the IP address searched from, and the web browser and version being used and our engineers will be able to investigate that further.