It all depends what you mean by 'open' (Listening for incoming connections -or- Creating outbound connections). Since you cite port '80' in your LISTENING port on the same port number.
Next it depends on what you mean when you say 'port' ... In particular 'who you are asking' ... If you ask any machine they may claim to be port 80 appear differently. Such as in the example given above (see Zeedos post) where port 80 and 81 on your public address (the outside perspective) maps to either port 80 on computer 1 or port 80 on computer 2 (The inside, or 'hosts' perspective)
I did not find the right solution from the Internet.
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