What is the relationship between the domain name of the host and the IP address of the host?

The relationship between the host's domain name and the host's IP address is: one IP address corresponds to multiple domain names. The IP address uses a digital form to identify the host in the computer network, and the domain name uses a character form to identify the host in the computer network. In the Internet, one domain name can correspond to one IP address, but one IP address can be corresponding to multiple domain names.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

The relationship between the domain name of the host and the IP address of the host is: one IP address corresponds to multiple domain names.

IP addresses and domain names are both used for network identification. The definition of computer network points out that a computer network connects computers in different geographical locations using communication equipment and communication lines. If these computers want to realize data communication, they must have unique address marks so that each other can find each other. Many books use the mailing process of letters to analogize the communication process of data in computer networks.

IP addresses use digital form to identify hosts in computer networks. For example, the commonly seen ones like 10.254.1.1, 172.16.1.10, 192.168.1.254, etc. all belong to the concept of IP addresses. There are currently two versions of IP addresses, one is the IPv4 version and the other is the IPv6 version.

Domain name uses a characterized form to identify the host in the computer network. For example, www.baidu.com., which we commonly use when surfing the Internet, belongs to the concept of domain name. Domain names adopt a hierarchical management approach. The organization responsible for global Internet domain name management is the Internet Corporation for Assigned Names and Numbers, or ICANN, and the organization responsible for China's domain name management is the China Internet Information Center, or CNNIC.

The domain name is to ensure that the access address of each website server is unique. It needs to be registered or filed with an institution or organization that uniformly manages domain names. Therefore, all host devices need an IP address to access the Internet, but not all host devices need to apply for a domain name. Therefore, our discussion of the relationship between IP addresses and domain names is based on the situation where the website server has both an IP address and a domain name. .

Conversion of IP address and domain name

Because the IP address is in digital form, it is not convenient for us to remember. Think about it, the digital identifier you come into contact with most often is the mobile phone number. How many 11-digit mobile phone numbers can you memorize? In order to facilitate everyone's memory, the digital IP address is mapped to the characterized domain name, which makes it easier to remember. It's similar to how we note a name for each contact's mobile phone number in the mobile phone address book.

When we access a website, we enter a domain name. At this time, we need a domain name server to resolve the domain name into the corresponding IP address, and then access the website server based on the IP address. Therefore, in terms of the corresponding relationship between IP addresses and domain names, we generally believe that one domain name corresponds to one IP address, but one IP address can correspond to multiple domain names, which means that multiple domain names are allowed to resolve to the same IP address, which is equivalent to one server Multiple websites deployed. At this time, some friends may ask whether it is feasible for one domain name to correspond to multiple IP addresses? If that is equivalent to parsing a domain name and resolving multiple IP addresses, it will be impossible to determine which network server is being accessed. From this point of view, this is not feasible.

For servers that provide us with various network services, IP addresses and domain names are just two different forms used to identify them. These two forms can Analyze each other and work together to complete the client host's access to the server, so that we can swim in the ocean of knowledge to our heart's content.

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