Check your weblogs for users ip address. However you would need to know date and time of visit for acuracy. Analytics will give you a breakdown of where your user comes from. Is there a reason you want to share that you need IP?
Google does not share that info with you at this point but it is showing the Country / Region / County / City - is not that good enough for you? If it is not, you should look for other tracking software or build your own one.