name : check-dns-availability.rst **To check the availability of a CNAME** The following command checks the availability of the subdomain ``my-cname.elasticbeanstalk.com``:: aws elasticbeanstalk check-dns-availability --cname-prefix my-cname Output:: { "Available": true, "FullyQualifiedCNAME": "my-cname.elasticbeanstalk.com" }