Block all IP only requests on nginx

server {

  listen 80;

  # server_name 8.8.8.8;# catch ip address
  server_name ~^0-9{1,3}\.0-9{1,3}\.0-9{1,3}\.0-9{1,3}$; # catch ip address
  deny all;

}

From https: //www.reddit.com/r/nginx/comments/3m1qbd/allow_all_domain_names_but_not_ip/