The domain information collection:
Browse the Web through a browser basic process
Since ip address is difficult to remember, by remembering a name, after the DNS server, DNS server returns the ip address corresponding to the client, we request various resources of the target site by ip address, destination website returns the corresponding content after receipt of the request to the browser page is displayed.
Domain name collection, registrars can collect mail, telephone, head of small and medium sites in general is webmaster, we can whois queries, find out addresses, email, phone information
icp record :
Domestic sites require registration, site to show purpose is to facilitate network management violations, site registration is neither domestic nor filing unprotected, illegal
whois query
icp record check
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Summarized above are personal opinions, comments on the correction.