Just recently gmail enabled more security for gmail user. Now you can track your recent sessions information which will gather IP address and also track when you last log-ed in to your accounts. You can access your accounts from office or from your home and easily by click to “details” you can track all IP address and date/times. You can use browser, mobile, POP3 and all this are tracked on your gmail accounts. In below a message also visible “This computer is using IP address…” and simply ensuring that you’re using this address from your pc. You can get more information in official gmail blogs.
Remote sign out and info to help you protect your Gmail account [via gmailblog]