What is China Unicom's dns address?

China Unicom’s DNS address is 210.21.4.130, and the backup DNS is: 221.5.88.88. With the host name, don't memorize the IP address of each IP device. Just remember the relatively intuitive and meaningful host name. This is the function of the DNS protocol.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

As we all know, every operator will have a DNS address. This DNS address can be used to set it accordingly when the user needs it. Under normal circumstances, the computer will automatically obtain the DNS address, but sometimes there will be problems with the network and the Internet cannot be connected. At this time, you need to set the DNS address, and you also need to know the DNS address of the corresponding operator, and then reset the DNS. So, what is the dns address of China Unicom? Today I will bring you a relevant tutorial, I hope it will be helpful to you.

What is the dns address of China Unicom?

For China Unicom broadband users, the primary dns is set to: 210.21.4.130, and the backup DNS is: 221.5.88.88.

Each IP address can have a host name. The host name consists of one or more strings separated by decimal points. With the host name, don't memorize the IP address of each IP device, just remember the relatively intuitive and meaningful host name. This is what the dns protocol does.

There are two ways to map host name to IP address:

1. Static mapping. The mapping from host to IP address is configured on each device. Each device Maintain its own mapping table independently and only for use by this device;

2. Dynamic mapping, establish a domain name resolution system (dns), and only configure the mapping from host to IP address on a dedicated dns server. Devices on the network that need to communicate using host names first need to query the dns server for the IP address corresponding to the host.

The process of finally obtaining the IP address corresponding to the host name through the host name is called domain name resolution (or host name resolution). When resolving a domain name, you can first use the static domain name resolution method. If the static domain name resolution fails, then use the dynamic domain name resolution method. Some commonly used domain names can be put into the static domain name resolution table, which can greatly improve the efficiency of domain name resolution.

The above is the detailed content of What is China Unicom's dns address?. For more information, please follow other related articles on the PHP Chinese website!