How does http3.ooo check your dns

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Created at: 15 May 2021
Updated at: 15 May 2021
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http3.ooo

Why the displayed DNS is not the DNS configured by my system

Here you need to understand the working principle of DNS first

The domain name has its own name server, and the name server controls all the records of this domain name
If you want to query the records of a domain name, you must ask the name server of this domain name

Then, assuming that the DNS configuration of your system is 8.8.8.8, you need to query the IP of http3.ooo. The approximate simplified steps are as follows:

You ask 8.8.8.8 for the record of http3.ooo
8.8.8.8 received your query
8.8.8.8 initiates a query to the name server of http3.ooo > 8.8.8.8 does not necessarily use the 8.8.8.8 IP to initiate a query, usually there is a server cluster inside, and an IP in its IP pool will be used to initiate a query
The name server of http3.ooo receives the query and displays the IP of the questioner on the web page