How to limit number of IPs?

[BOSZORMENYI Zoltan <zoltan.boszormenyi@xxxxxxxxx>]

Hi,

I have to limit the number of different IP addresses
that may connect to a certain port. Is it possible?
I know about connlimit, but it can only limit
the number of connections per-IP or per-subnet.
I am not subscribed, please answer directly, too.

Thanks in advance and best regards,
Zoltán Böszörményi