redirect all unconfigured subdomains

Hi all,
I'm happy to join NGINX community and want to share with you with my little problem.

I've got wildcard entry for example.com in my DNS which points all subdomains to some machine
* IN A 172.172.172.172
While NGINX configuration for this domain contains only actively used subdomain names
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
...
}
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?

Best Regards
Arek