The hostname, rather than IP address, is provided so that you can change the host IP address without having to update the DNS SOA record.

提供主机名而不是 IP 地址是为了使您能够更改主机 IP 地址而不必更新 DNS SOA 记录。

youdao

Although the method used to update your a record varies, in general it consists of knowing the id and password of the account at your DNS provider, as well as how to change records.

尽管更新A记录所用的方法各不相同，但是一般都需要知道您在DNS提供商的账户ID和密码，以及如何修改记录。

youdao

Note that you might need to update your network's local DNS server to let it know about the new host as well.

注意，您可能需要更新网络的本地DNS服务器，让它知道新的主机。

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