If you want to find IP Address of your computer with the Mac OS, please follow the steps below to find your PC's IP address:
Step 1. Open System Preferences. (Either click the cogs icon in your dock, or hit the Apple logo drop-down menu at the top left of your screen, and then select System Preferences.)
Step 2. Click Network (under the Internet & Wireless section).
Step 3. Click the option in the left-hand bar that has a green dot, then check the information that appears in the pane on the right. It should say Connected at the top; in the smaller text underneath it will tell you what your internal IP address is.