What is a MAC address? What is it used for?
A MAC address, or Media Access Control address, is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment. This use is common in most IEEE 802 networking technologies, including Ethernet, Wi-Fi, and Bluetooth. Within the Open Systems Interconnection (OSI) network model, MAC addresses are used in the medium access control protocol sublayer of the data link layer. As typically represented, MAC addresses are recognizable as six groups of two hexadecimal digits, separated by hyphens, colons, or without a separator.

MAC addresses are primarily assigned by device manufacturers, and are therefore often referred to as the burned-in address, or as an Ethernet hardware address, hardware address, or physical address. Each address can be stored in hardware, such as the card's read-only memory, or by a firmware mechanism. Many network interfaces, however, support changing their MAC address. The address typically includes a manufacturer's organizationally unique identifier (OUI).

MAC addresses are used for a variety of purposes, including:

* Identifying devices on a network
* Controlling access to a network
* Troubleshooting network problems
* Blocking unwanted traffic
* Tracking devices

MAC addresses are not routable on the Internet, but they can be used to identify devices that are connected to the Internet. This information can be used by network administrators to track down sources of malicious traffic or to block unauthorized devices from accessing the network.

Here are some examples of how MAC addresses are used:

* A wireless router can use MAC addresses to control access to the network. For example, a router can be configured to only allow devices with specific MAC addresses to connect to the network.
* A firewall can use MAC addresses to block unwanted traffic. For example, a firewall can be configured to block all traffic from devices with specific MAC addresses.
* A network administrator can use MAC addresses to track devices on a network. For example, an administrator can use MAC addresses to see which devices are connected to the network and where they are located.

MAC addresses are a valuable tool for network administrators and security professionals. By understanding how MAC addresses work, you can better understand how your network operates and how to protect it from unauthorized access.
Can an ISP track me using my MAC address? can a website?
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.
Ahh.. Right.
But are there any way to change my MAC address, do you have any software suggestion that I could do that?
Yes! You can use **TMAC**, a freeware software by Technitium.

Technitium MAC Address Changer allows you to change (*spoof*) Media Access Control (**MAC**) Address of your Network Interface Card (**NIC**) instantly. It has a very simple user interface and provides ample information regarding each NIC in the machine. Every NIC has a MAC address hard coded in its circuit by the manufacturer. This hard coded MAC address is used by Windows drivers to access Ethernet Network (**LAN**). This tool can set a new MAC address to your NIC, bypassing the original hard coded MAC address. Technitium MAC Address Changer is a must tool in every security professionals tool box.