[stunnel-users] Accept connection from sub-net?

[v v]

Hi,
Is it possible to configure stunnel server to accept connection from any IP in some subnet.
For example, 111.22.33.xx.

The proxy I connect through every time uses the different IP (from some IP pool) to connect to stunnel server. I don't want to add to the config file 255 possible host addresses. 

I don't see any suitable option in the stunnel documentation.
Do I miss something? Any idea it could be done?

Thanks,
vov