I had come across many queries about the hacking of Google account(Gmail). So, i had decided to check my own Gmail account whether it is hacked or not? How to know if your Gmail account has been compromised and hacked and what to do to get it back?. Gmail has an in-built feature, which helps to determine suspicious login sessions.
Check “Last Account Activity” in your inbox
Login Session Details of Your Account
Click on the link ‘Details’ shown in the above Image, it will display all the recent activities on your Gmail account(login and logout details)
Check & See Your IP Address
If you use any 3rd party services which hook-up to your Gmail account, they will almost certainly show up in your activity log. To do your own investigation, you can use various freely available DomainTools to identify the IP address. This will help you to identify any suspicious activity if your Gmail account is being hacked.
Activity Monitoring By Google
This utility is provided by Gmail, it tracks the user who are accessing the Account. In the image below, browser type and all the details are shown with date & time.
Log out from all Gmail sessions
To keep your account safe from being hacked, you must log out all the sessions of your mail Account
Note: If your account really get hacked than immediately change your password and check the recent activity on your Gmail session and block that IP address which is interfering into your Gmail Account.