Unable to open ports using terminal

I need to open port 16004 and have attempted to do so via Terminal by entering:
sudo ipfw add allow tcp from 16004 to 1600.
However when i run port scan from the Network Utility it does not show up as open.
Is this the correct syntax? Am I missing something?
If someone could help please.

Sorry but can you explain further
man ipfw tells you everything you need to know (and more) about setting ipfw rules.
What goes in place of the 'any to any'? anything or is that it?
The syntax of an ipfw allow rule is:
allow [protocol] from [souce] to [dest] [port]
So the statement:
allow tcp from any to any 16004
says that any source address is allowed to connect to any destination address on port 16004. To be more secure you might lock down the port so that specific IP addresses can connect, e.g.:
allow tcp from 192.168.1.0/24 to in 16004
this says that any machine on the 192.168.1.0/24 network is allowed to connect to any interface on the current machine ('in') on port 16004

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