I believe you want to to block unidentified domain requests to Amazon Route 53, you need to enable privacy protection for a domain that you registered using Route 53.
• Sign in to the AWS Management Console and open the Route 53 console 
• In the navigation pane, choose Registered Domains.
• Choose the name of the domain that you want to enable or disable privacy protection for.
• Choose Edit Contacts.
• Choose whether to hide contact information. You must specify the same privacy setting for all three contacts: administrative, registrant, and technical.
• Choose Save.
Refer to References
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