DNS- Domain Name System (DNS) is a distributed database on the World Wide Web, in which domain names and IP addresses are mapped to each other, which makes it easier for users to access the Internet without having to remember IP strings that can be directly read by machines. The process of finally getting the IP address corresponding to the domain name is called domain name resolution. DNS protocol runs on top of UDP protocol, using port number 53. In the RFC document, RFC 2 18 1 has the specification of DNS, RFC 2 136 describes the dynamic update of DNS, and RFC 2308 describes the reverse cache of DNS queries.

Under the Windows platform, use the command line tool to enter nslookup, and the returned results include the IP address and alias corresponding to the domain name. In addition to the above methods, you can also query the site dns through some DNS, such as foreign and domestic DNS information of domain names.

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domain name system