Domain name resolution is well-known to people who often use websites. Do you know what is universal domain name resolution? First, let's explain the concept. The so-called "universal domain name resolution" refers to the use of the wildcard * (asterisk) as the sub domain name, so that all sub domains point to the same IP address. However, during the parsing process, some things should be noted: the horizontal bar "/" and the left diagonal bar of the "-" dot cannot be used in general parsing. The problem is that these three characters cannot exist in the first character of the secondary domain name, such as -. yourdomain.cn or - your domain . cn or.5.yourdomain.cn。 Let me give you an example. It's quite clear. For example, your domain name is yourdomain.cn: make a record of the subdomain name A of *. yourdomain.cn pointing to 222.222.222.222, and then when the visitor enters "123. abc. cn" or "123.123. abc. cn", or even! Any character, such as @ #. $% $ 6543.ww.a.yourdomain.cn.cn can point to the IP address of 222.222.222.222. In fact, domain name resolution is not difficult. As long as the previous settings are completed, there will be no problem.