关于域名whois状态的

Domain Status: clientTransferProhibited 域名禁止转让

Domain Status: clientDeleteProhibited域名禁止删除

Domain Status: clientUpdateProhibited域名禁止更新

ACTIVE: The registry sets this status. The domain can be modified by the registrar. The domain can be renewed. The domain will be included in the zone if the domain has been delegated to at least one name server.

（激活状态）

REGISTRY-LOCK: The registry sets this status. The domain can not be modified or deleted by the registrar. The registry must remove the REGISTRY-LOCK status for the registrar to modify the domain. The domain can be renewed. The domain will be included in the zone if the domain has been delegated to at least one name server.

REGISTRAR-LOCK: The sponsoring registrar sets this status. The domain can not be modified or deleted. The registrar must remove REGISTRAR-LOCK status to modify the domain. The domain can be renewed. The domain will be included in the zone.

（注册商锁定）

REGISTRY-HOLD: The registry sets this status. The domain can not be modified or deleted by the registrar. The registry must remove the REGISTRY-HOLD status for the registrar to modify the domain. The domain can be renewed. The domain will not be included in the zone.

REGISTRAR-HOLD: The sponsoring registrar sets this status. The domain can not be modified or deleted. The registrar must remove REGISTRAR-HOLD status to modify the domain. The domain can be renewed. The domain will not be included in the zone.

（注册商保留）

REDEMPTIONPERIOD: The registry sets this status when a registrar requests that the domain name be deleted from the registry and the domain has been registered for more than 5 calendar days (if the delete request is received within 5 days of initial domain registration it will instead be deleted immediately). The domain will not be included in the zone. The domain can not be modified or purgedit can only be restored. Any other registrar requests to modify or otherwise update the domain will be rejected. The domain will be held in this status for a maximum of 30 calendar days.

PENDINGRESTORE: The registry sets this status after a registrar requests restoration of a domain that is in REDEMPTIONPERIOD status. The domain will be included in the zone. Registrar requests to modify or otherwise update the domain will be rejected. The domain will be held in this status while the registry waits for the registrar to provide required restoration documentation. If the registrar fails to provide documentation to the registry within 7 calendar days to confirm the restoration request, the domain will revert to REDEMPTIONPERIOD status. The domain status will be set to ACTIVE only if the registrar provides documentation to the registry within 7 calendar days to confirm the restoration request.

PENDINGDELETE: The registry sets this status after a domain has been set in REDEMPTIONPERIOD status and the domain has not been restored by the registrar. The domain will not be included in the zone. Once in this status all registrar requests to modify or otherwise update the domain will be rejected. The domain will be purged from the registry database after being in this status for 5 calendar days.

根域名服务器（英语：root name server）是互联网域名解析系统（DNS）中最高级别的域名服务器，负责返回顶级域名的权威域名服务器的地址，全球有386台根服务器，被编号为A到M共13个标号。大部分借由任播（Anycast）技术，编号相同的根服务器使用同一个IP，386台根服务器总共只使用13个IP，因此可以抵抗针对其所进行的分布式拒绝服务攻击（DDoS）。

中国大陆在北京有两台编号为L的根服务器镜像，编号为F、I、J的各一，共5台镜像；香港有A、F、I、J、L五个根域六台根服务器镜像（其中编号为J的根服务器有2台）；台湾则有F、I、J三个根域3台镜像。

DNS服务器是计算机域名系统 (Domain Name System 或Domain Name Service) 的缩写，它是由解析器和域名服务器组成的。域名服务器是指保存有该网络中所有主机的域名和对应IP地址，并具有将域名转换为IP地址功能的服务器。

域名系统采用类似目录树的等级结构。域名服务器为客户机、服务器模式中的服务器方，它主要有两种形式：主服务器和转发服务器。将域名映射为IP地址的过程就称为“域名解析”。

在Internet上域名与IP地址之间是一对一(或者多对一)的，也可采用DNS轮循实现一对多，域名虽然便于人们记忆，但机器之间只认IP地址，它们之间的转换工作称为域名解析，域名解析需要由专门的域名解析服务器来完成，DNS就是进行域名解析的服务器。

目前，市场上的第三方专业DNS解析有：dns盾，dnspod等

DNS命名用于Internet等TCP/IP网络中，通过用户友好的名称查找计算机和服务。当用户在应用程序中输入DNS名称时，DNS服务 可以将此名称解析为与之相关的其他信息，如IP地址。你在上网时输入的网址，是通过域名解析系统解析找到了相对应的IP地址，这样才能上网。其实，域名的 最终指向是IP。

两个dns服务器是怕一个挂掉，另一个还能使用。

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