Outputs Common Name from SSL certificates when given a list of ip addresses, hostnames or urls.

Usage of cndump:
  -c int
    	number of concurrent requests to make (default 10)
  -f string
    	path to list of urls or ip addresses, defaults to stdin if left blank
  -r	follow redirects (default false)
  -t int
    	timeout in seconds (default 5)
  -u	show urls in output