Look, my friend, before I answer you, you need to understand something, or rather, the difference between two things:
1- Hosting IP (Data Center): This is the IP provided to you by global companies like Amazon, DigitalOcean, and others. Most VPN companies buy VPS or systems from them, convert them into their own VPNs, and then resell them. This depends on the company.
2- Residential IP: This is the IP provided by internet service providers of all types. Any ISP that gives you access to it comes from the same company, regardless of the company. It's a source from the same country. Do you understand?
Now that we understand the difference, let's move on to the most common ways you can be exposed:
1- The concept and term (DNS leak): Look, my friend, the internet is vast. When you activate a VPN or other connection and try to connect to a specific website, what does your device do? It sends a real connection from your real IP address to the website, even though you're running a VPN. This is how you're exposed, so you need to disable this option or use extensions to block it.
2- The concept and term (DPI): This type of technology is most commonly used by governments. Every VPN and every connection method differs from the original packet structure and order. For example, (protocols specific to OpenVPN and WireGraduate) have a specific packet order, code, and unique signature. DPI technology examines and interprets this packet order to distinguish it from the original packet, thus directly revealing that a VPN is active.
3- The most common concept and term (IP Reputation) Global websites have something called a data center for their hosting providers (IP addresses belonging to these companies). We explained this concept previously; when you try to access a website while connected to one of these IP domains, you are detected.
4- The concept and term (WebRTC): This is a vulnerability that allows your browser, whether Firefox or another, to send real IP addresses and information to websites. This is very common and should be patched, even though it exists in newer versions. This is done through very simple JavaScript commands.
5- Time zone and time conflict (very important): You know, my friend, that when you send data to a website, it naturally sends a set of headers, such as your device version, browser, time, etc. What will this website do? The website will compare, for example, your IP address in London with your laptop's time zone. What will it show? That you're using a location changer, which is very dangerous.
That's why you often see websites detecting you, governments quickly tracking you, and even hackers sometimes unable to commit fraud. You can find information about this in something called "block IP lists"; search for it online.
Also, an additional piece of information: recently, some VPN websites have started providing you with a residential IP address, which reduces detection. However, with recent advancements, especially modern banking websites, you'll be comparing the IP address used to log in to your account with the new login IP and requesting identity verification. Do you understand?
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