Actually, I do not know whether or not my Gmail account is compromised given the details.
I am on a desktop computer right now and logged in to my account.
I have got a Windows phone with Gmail synced but it is another account.
On the desktop computer, as soon as I log in, I can see a warning below on the right corner saying that My account is being used in another location. I click on Details and it says that my account is used in another location but strangely, it has got the same IP address of my current location. I told you that I do not have it on my mobile phone, and it is always being used here (neither on my laptop!). So what is going on?
BTW, maybe it's because I have the Hangouts open as you can see on the left of the below image. Or maybe not, because such a thing has never happened before, but only for three weeks.
Best Answer
It probably is the Hangouts app. Other possible things might be if you've signed in to Chrome, Picasa, Google Music uploader, Google Photos backup, Google Drive. It could also be if you've logged in to Google with a different browser.
Since it's coming from the same IP, it's certainly something behind your router, so I don't think you have much to worry about. I'm no security expert, however.
One thing you can do is:
If it is Hangouts, or Google Drive sync, or whatever, you should get re-prompted to log in.
You can also have a look at your Google Account activity to get further clues.
Go myaccount.google.com and look in the "Sign in & security" section. You can see any recent security alerts (like a changed password), what devices have connected, and what apps are connected to your account. You can also do a "Security checkup" to see if you're at risk and to tighten down your account. At the very least you may want to change your password.