Should I show users their IP address?

1. Can website owners see my IP address?
2. Does Google track by IP address?
3. Can multiple people have the same IP address?

Can website owners see my IP address?

They can identify your ISP and figure out approximately where you're located. They will likely be able to identify your neighborhood, but not your home. And they can see how often you (or someone else sharing your router) visit their website. But they won't be able to see that forever.

Does Google track by IP address?

From the IP address of your Internet connection

This means that any website that you use, including google.com, may get some information about your general area. Like many other Internet services, Google can use information about the general area that you're in to provide some basic services.

Can multiple people have the same IP address?

Never. There are IP addresses that are part of the internet world-wide, and are 100% unique. For example, the IP address that your ISP gives on your cable connection. If you connect your computer directly to your cable modem (NO ROUTER in between), then you will be assigned a public IP address.