Domain Name and subdomain name

Www.baidu.com is a subdomain name of Baidu.com. It can be tested by Ping.

Ping Baidu.com 123.125.114.144

Ping www.baidu.com220.181.111.147

Use proxy to go abroad

Ping Baidu.com220.181.111.85

Ping www.baidu.com61.135.169.125

Ping music.baidu.com202.108.23.33Is a subdomain name of Baidu.com

Ping zhidao.baidu.com123.125.115.90Is a subdomain name of Baidu.com

Ping www.zhidao.baidu.com

Ping www.music.baidu.com

It cannot be pinged.

Different IP addresses indicate different servers. portal websites like Baidu use global distribution to allow you to access the server closest to you.

In this way, the speed is faster, the pressure on a single server is reduced, and load balancing is achieved. Of course, Baidu's technology is far more than that.

Generally, when registering a domain name, you must register a domain name such as xxx.com or xxx.com.cn. After registration, you can ask the domain name provider to direct the DNS resolution address of this domain name to your own DNS server, then you can manage the second-level domain name of this domain name. For example, WWW is generally used as the primary service of a domain name, And bbs.xxx.com is the service where the BBS of that website is located. It can all point to different IP addresses.