Net::Server or POE look like great tools but they would be an overkill for such a small operation. From what I saw, they might be useful for building a more complex app or a generic base. But for a listen-reply server IO::Socket::INET gives all that is needed, which is not much - send and recv.

Also there are a many other programs of mine which need to have this feature, all of which are already using IO::Socket::INET.