xinetd is a replacement for inetd, the internet services daemon. Anybody can use it to start servers that don't require privileged ports because xinetd does not require that the services in its configuration file be listed in /etc/services. It can do access control on all services based on the address of the remote host and time of access. Access control works on all services, whether multi-threaded or single-threaded and for both the TCP and UDP protocols.