IP address in server_name

[Igor Clark]

Hi there - is it possible to have a virtual host identified by IP  
address as well as a default virtual host?

	listen	22.22.22.22;
	server_name	22.22.22.22;

http://22.22.22.22/

I have another server block with

	server_name	_;

defined, and this seems to be taking precedence - is that expected?  
How can I get round it if so?

Thanks,
Igor