Not that Google is a saint in this regards, but at least it’s fast, very fast. But the interesting thing is that the routers provided by the ISPs can have their own DNS which seems to be used for tracking purposes. And there’s nothing wrong with that, especially if the devices connected to the network simply require Internet access. Most rely on the Google Public DNS, using one of the following IP addresses: 8.8.8.8 or 8.8.4.4. Now, most people don’t bother changing the default settings from their router or client device (be it a Desktop PC, a laptop, a smartphone or a smart fridge), so the DNS server that they use is most likely a public one. Obviously IPv4 has simpler numbers, while IPv6 made it a bit more complicated, but the idea is that the DNS keeps us sane. This way, you don’t have to type weird numbers. The DNS (Domain Name System) has the role of translating the hostname that you want to access to the IP address associated with that hostname. If you don’t know what DNS is, I will keep it short and simple. How to check the DNS queries in your network?.How to check which DNS servers are used by a specific device?.
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