独立域名/主机名的名称
有人知道最小（IP）域名的正确术语是什么吗？它直观地表明通过“典型”渠道注册的域名？
例如，该术语表示 - google.com - bbc.co.uk
但不是： - www.google.com - code.google.com - co.uk
（术语二级域不太有效，因为后一个反例，其中 co. 是托管在 .uk 国家/地区代码顶级域中的二级域名也许不存在这样的术语？）
编辑 嗯...无法自行再回答6个小时。嘘。
AFAICS，没有具体/权威的术语。
在 《SEO 艺术》作者：Eric Enge、Stephan Spencer、Rand Fishkin、Jessie C. Stricchiola，他们使用诸如完整根域/主机域/付费级别域/第二域之类的术语级别域。据我所知，这些术语都不是标准的，而后一个术语实际上是完全不正确/含糊的。 此页面上提供了类似的讨论。
nist.gov 使用术语企业级域，但它再次等同于二级域，并且在 此报告用于第三/第四等。级别域。
Anyone know what the correct term is for a minimal (IP) domain name which intuitively indicates a domain registered through "typical" channels?
E.g., the term would indicate
- google.com
- bbc.co.uk
But not:
- www.google.com
- code.google.com
- co.uk
(The term second-level domain doesn't quite work beacuse of the latter counter-example, where co. is the second-level domain name hosted within the .uk country code top-level domain. Maybe such a term does not exist?)
EDIT Hmm... can't self-answer for another 6 hours. Boo.
AFAICS, there's no concrete/authoritative term.
In The Art of SEO By Eric Enge, Stephan Spencer, Rand Fishkin, Jessie C. Stricchiola, they use terms like complete root domain/host domain/pay-level domain/second-level domain. As far as I can see, none of these terms is standard, and the latter term is actually strictly incorrect/ambiguous. Similar discussion is available on this page.
nist.gov use the term enterprise-level domain, but again it's equated with second-level domain and used conflictingly in this report for third/fourth/etc. level domains.
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Mozilla 基金会使用术语 公共后缀 来描述可以通过典型渠道注册的域，它定义为包括 <代码>.com、
.co.uk和pvt.k12.wy.us。然而，该术语的使用可能并不标准。编辑：公共后缀列表上的维基百科条目使用术语“有效顶级域名”，其中似乎描述了这个概念，尽管它似乎没有被广泛使用。
The Mozilla Foundation uses the term Public Suffix to describe domains that can be registered through typical channels, which it defines to include
.com,.co.uk, andpvt.k12.wy.us. The usage of this terminology may not be standard, however.Edit: The Wikipedia entry on the Public Suffix list uses the term "effective top level domain", which appears to describe this concept, although it doesn't appear to be in widespread use.
对于 google.com，术语“第二级”是正确的；对于 bbc.co.uk，术语“第三级”是正确的。
国家/地区特定 TLD 是 ccTLD。
“co.uk”中的“co”被称为“通用类别第二级”。
有关维基百科的完整详细信息
The term 'second-level' is correct for google.com and 'third-level' for bbc.co.uk.
The country specific TLD is ccTLD.
The 'co' in 'co.uk' is termed 'generic-category 2nd level'.
Full details on Wikipedia
我不确定您所说的“典型”渠道是什么意思，但我将一般性地解释一些您可能会觉得方便的术语：
顶级域名 (TLD) 是以 .com 结尾的域名， .net、.org 或其他“主要”后缀。这包括主要国家/地区后缀，例如 .uk 和 .us 完整列表位于：http://en .wikipedia.org/wiki/List_of_Internet_top-level_domains
子域最好通过示例进行解释。 code.google.com 是 google.com 的子域，mail.yahoo.com 是 yahoo.com 的子域。
编辑：
.co.uk 是二级域名。虽然它是一个流行的选择，但它实际上只是 .uk 的子域
I'm not sure what you mean by "typical" channels, but I'll explain in general a few terms you might find handy:
Top Level Domains (TLDs) are domains that end in .com, .net, .org, or other "major" suffixes. This includes major country endings such as .uk and .us The full list is here: http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains
Subdomains are best explained by example. code.google.com is a subdomain of google.com, mail.yahoo.com is a subdomain of yahoo.com.
Edit:
.co.uk is a second level domain. While it's a popular choice, it is really just a subdomain of .uk