Yes, your ISP can track you using your MAC address. Your MAC address is unique to your device, so your ISP can use it to identify you and track your online activity. For example, your ISP could use your MAC address to see which websites you visit, which files you download, and who you communicate with online.

Websites cannot track you using your MAC address directly. However, websites can use other methods to track you, such as cookies, browser fingerprinting, and IP address tracking. By combining these methods, websites can build up a profile of you and track your online activity even if you are using a different MAC address.

There are a few things you can do to protect your privacy from tracking:

* Use a VPN. A VPN encrypts your traffic and hides your IP address, making it difficult for your ISP and websites to track you.
* Clear your cookies regularly. Cookies are small files that websites store on your device to track your activity. Clearing your cookies will remove these files and make it more difficult for websites to track you.
* Use a privacy-focused browser. There are a number of browsers that are designed to protect your privacy, such as Brave and Firefox. These browsers can block cookies, fingerprinting scripts, and other tracking methods.

You can also change your MAC address, but this is not a long-term solution. Most ISPs can detect MAC address changes and flag your account. Additionally, some websites may block devices with changed MAC addresses.

It is important to note that there is no one-size-fits-all solution to tracking protection. The best approach for you will depend on your individual needs and preferences.
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