How to query the domain name service provider of a website?

You can get to know the domain name registrar through the domain name Whois information, and then contact their official, who will give you the contact information of the agent. The inquiry address has been consulted to you, and the registrar will be displayed on it. Regarding filing, a subject can only have one filing number, that is, your ID card has been filed, and the new website needs to provide the filing password. If you don't know the filing password, you can get it from the filing system of the Ministry of Industry and Information Technology, provided that the filing information must be your own. As long as the domain name registration information is yours, you can get the password. Or directly find the local communication administration to submit domain name information and ID card cancellation for the record, and then re-record!