title: NGINX - redirect all unconfigured subdomains
body: <p>I'm happy to join community and want to share with you with my little problem.</p>
  
  <p>I've got wildcard entry for example.com in my DNS which points all subdomains to some machine</p>
  
  <pre><code>* IN A 172.172.172.172
  </code></pre>
  
  <p>While NGINX configuration for this domain contains only actively used subdomain names</p>
  
  <pre><code>server {
  listen 10.0.0.1:80;
  server_name example.com www.example.com
  moskva.example.com www.moskva.example.com
  tokyo.example.com www.tokyo.example.com;
  ...
  }
  </code></pre>
  
  <p>What I want to achieve is directing all unconfigured subdomains like 'mistake.example.com' to specific address.
  Is there any elegant way of solving this problem?</p>
  
  <p>Best Regards
  Arek</p>