A password is always necessary to connect a device to a Dropbox account. If you're seeing a device you don't recognize, it's possible you signed in to your Dropbox on a new device and authorized it by mistake. It's also possible that someone has access to your password and email account. This can happen if you ever shared these with other people.
If you're seeing devices you don't recognized linked to your Dropbox account, first make sure you secure your email account. Then secure your Dropbox account by following the steps in this article.
Find out the geolocation of a device that's linked to your Dropbox
Dropbox logs the IP address of each device that accesses your account. You can use the IP address to discover the login location and the internet provider used. This information is accessible from the Dropbox website on your security page. Roll your mouse over the "i" icon to see the last IP address that was recorded. This information will appear whenever a linked device signs in to the internet with Dropbox running.
We currently display the country of the last known IP address, but you can use any IP address lookup service for more detailed information. Please note that the country IP geolocation isn't always accurate. Some IP addresses might be associated with the wrong country. If the country isn't correct, you can check it using any online IP address lookup tool. Different websites might give you different answers, so we recommend trying a few to get a varied perspective on this.
Unlink a device
Also on the security page, you can unlink any computer or device you don't recognize from your account by clicking the "X" next to it.
This will turn off syncing to and from that computer and prevent unauthorized changes to your Dropbox account.
Secure your Dropbox and email account
- Change your password for your Dropbox account. Be sure to use a strong password that you don't use for any other service. When hackers obtain sensitive information from one service, they use it to access accounts at other services. This is made possible by the fact that many people use the same password across multiple services.
- Change the password to the email account that you use for your Dropbox account.
- Unlink any other unfamiliar devices, web sessions, and apps linked to your account by going to your security page.
- Set up two-step verification, which can protect your account even if your password is compromised.
Please also note that the Dropbox folder is just a normal folder on your computer, so it's no more or less secure than every other folder on your computer. We recommend that you follow good security practices to protect your entire computer. This includes requiring a password to log in to your account, and to resume from sleep, screen savers and lock screens.