dns - apex/naked/bare/root 域名的正确术语是什么？

Question

当您搜索词 Apex Domains在 Google 搜索中，您获得的首页是 https://help.github.com/en/articles/about-supported-custom-domains ，这将概念解释为:

An apex domain is a root domain that does not contain a subdomain part. Apex domains are also known as base, bare, naked, root apex, or zone apex domains. In DNS provider settings apex domains are sometimes symbolized by an @ symbol. For example:

• example.com is an apex domain because it doesn't have any subdomain parts.
• Whereas www.example.com is not an apex domain because it contains the > subdomain part www.

仅此描述就说明此概念也称为

基域

裸域

裸域

根顶点域

区域顶级域

这个概念真的没有一个公认的名字吗？

Answer 1

如果您想在技术上 100% 正确，IETF 的最新 RFC 确实提供了有关所有 DNS 术语的准确信息。
https://www.rfc-editor.org/rfc/rfc7719 “DNS 术语”。
请注意，这涉及技术术语，而不是营销术语。
如果您在其中搜索顶点，您会得到:

Apex: The point in the tree at an owner of an SOA andcorrespondingauthoritative NS RRset. This is also called the "zone apex".[RFC4033] defines it as "the name at the child's side of a zonecut". The "apex" can usefully be thought of as a data-theoreticdescription of a tree structure, and "origin" is the name of thesame concept when it is implemented in zone files. Thedistinction is not always maintained in use, however, and one canfind uses that conflict subtly with this definition. [RFC1034]uses the term "top node of the zone" as a synonym of "apex", butthat term is not widely used. These days, the first sense of"origin" (above) and "apex" are often used interchangeably.

鉴于此，github定义略有错误。 example.com是区域的顶点 example.com (因为它是从 .com 委托(delegate)的，我们肯定知道)，它有 www.example.com在里面。
谈论域和子域会带来许多危险，因为您无法仅通过查看字符串来判断区域切割在哪里，因此“子域”从哪里开始。学习示例: www.dk , www.minefi.gouv.fr开始。
只需查看 www.example.com (不做任何类型的 DNS 查询)你不能说 www只是 example.com 中的一个标签区域，或者如果 www.example.com是一个顶点，因为它已从 example.com 委托(delegate).
当然，有人可能会争辩说 www给出提示，但随后将其替换为 admin ，谜团仍未解开。