202. 100. 128.68 is preferred.
Spare parts 202. 100. 138.68
DNS server is the abbreviation of computer domain name system (or domain name service), which consists of domain name resolver and domain name server. Domain name server refers to a server that stores domain names and corresponding IP addresses of all hosts in the network and has the function of converting domain names into IP addresses. A domain name must correspond to an IP address, and an IP address does not necessarily have a domain name. Domain name system adopts a hierarchical structure similar to directory tree. Domain name server is a client/server mode server, which mainly has two forms: main server and forwarding server.