The inetd is started at boot time by the entry in /etc/rc.conf:
inetd_enable="YES"
You need to restart inetd after making a change to /etc/inetd.conf. This can be done by rebooting the system or running this command:
# kill -HUP `cat /var/run/inetd.pid`
or to use the numeric format:
# kill -1 `cat /var/run/inetd.pid`
and another way:
# killall -1 inetd
or:
# killall -HUP inetd
On 5.x machines:
# /etc/rc.d/$servicename restart
where $servicename is the service you wish to restart.
The port numbers for each service can be found in /etc/services.