# netstat -a | grep ntp
udp4 0 0 localhost.ntp *.*
udp6 0 0 localhost.ntp *.*
udp6 0 0 fe90::4352:3aaf:.ntp *.*
udp4 0 0 MyBigFirewall.ntp *.*
udp4 0 0 *.ntp *.*
udp6 0 0 *.ntp *.*