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See open ports in Mac?

Edson Cezar
Ranch Hand

Joined: Mar 05, 2011
Posts: 86
There are a way to see at the prompt, open ports on mac, and block it, if possible ?

Thanks in advance !
Greg Charles

Joined: Oct 01, 2001
Posts: 2929

lsof | grep LISTEN

I just tried that though and it didn't seem to show me everything. As for blocking ports, that would be the job of firewall. I don't think that functionality is build into OSX, but I'm sure there are software firewalls available that you could install.
Andrew Monkhouse
author and jackaroo
Marshal Commander

Joined: Mar 28, 2003
Posts: 11730

You might want to look at Apple's OS X: About the application firewall page.

The Sun Certified Java Developer Exam with J2SE 5: paper version from Amazon, PDF from Apress, Online reference: Books 24x7 Personal blog
I agree. Here's the link:
subject: See open ports in Mac?
It's not a secret anymore!