Want to know which ports are allowed (or open) to use in your organization?
You can check all ports with http://portquiz.net/
In bash somthing like this would help you get going:

for i in `seq 1024 65535`; do if nc -z portquiz.net $i; then echo “Port $i Success”; :; fi done

You will now get a fine list of outgoing ports that are open. Remember that just because some port is open, it doesn’t necessarily mean that it is allowed to use it!