blocks|key|4554816|text|每个标签最多可包含63个字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4554817|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Each label may contain up to 63 characters.

blocks|key|1205290|text|URI生成器应使用符合DNS语法的名称，即使使用DNS不是很明显，并且应将这些名称的长度限制为不超过255个字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1205291|https://www.rfc-editor.org/rfc/rfc3986|offset|length|1205292|“DNS本身只对可用于标识资源记录的特定标签施加一个限制。该限制与标签和全名的长度有关。任何一个标签的长度限制在1到63个八位字节之间。一个完整域名限制为255个八位字节(包括分隔符)。”|1205293|https://www.rfc-editor.org/rfc/rfc2181|1205294|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|12|0|0|0|0|12|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|J|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|C]]|Q|$5|M|N|O|A|$P|I]]]]

&quot;URI producers should use names
that conform to the DNS syntax, even when use of DNS is not
immediately apparent, and should limit these names to no more than
255 characters in length.&quot;
<a href="https://www.rfc-editor.org/rfc/rfc3986" rel="nofollow noreferrer">https://www.rfc-editor.org/rfc/rfc3986</a>
&quot;The DNS itself places only one restriction on the particular labels
that can be used to identify resource records. That one restriction
relates to the length of the label and the full name. The length of
any one label is limited to between 1 and 63 octets. A full domain
name is limited to 255 octets (including the separators).&quot;
<a href="https://www.rfc-editor.org/rfc/rfc2181" rel="nofollow noreferrer">https://www.rfc-editor.org/rfc/rfc2181</a>

blocks|key|366529|text|在其外部点分标签规范中，完整域名的总长度不得超过253个字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|366530|http://en.wikipedia.org/wiki/Domain_Name_System|offset|length|366531|如果你有接近253个字符的域名，我认为你应该寻找一个更短的域名...|366532|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1B|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

The full domain name may not exceed a total length of 253 characters in its external dotted-label specification.

<a href="http://en.wikipedia.org/wiki/Domain_Name_System" rel="noreferrer">http://en.wikipedia.org/wiki/Domain_Name_System</a>

If you are getting anywhere close to 253 characters, I think you should look for a shorter domain name...

blocks|key|5037258|text|作为演示，此网站的域名为63个字符，允许的最大长度为：http://63-characters-is-the-longest-possible-domain-name-for-a-website.com|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5037259|entityMap|0|LINK|mutability|MUTABLE|url|http://63-characters-is-the-longest-possible-domain-name-for-a-website.com/^0|R|22|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

As a demonstration, this website has a 63 characters domain name, the maximum allowed:
<a href="http://63-characters-is-the-longest-possible-domain-name-for-a-website.com" rel="noreferrer">http://63-characters-is-the-longest-possible-domain-name-for-a-website.com</a>

blocks|key|4554876|text|TLDR应答|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4554877|使用以下限制：|4554878|二进制八位数：61+|offset|length|style|BOLD|CODE|4554879|。|blockquote|4554880|4554881|名称：253八位字节。|4554882|4554883|即使你超过了这些限制，许多应用程序也能正常工作(比如Gmail)，但也有许多较老的应用程序无法工作。|4554884|来源|4554885|+(发布于1987年11月)，一个公认的Internet+Standard，当在浏览器中查看时，对子域和整个域长度提供了以下限制...|4554886|4554887|+DNS中的各种对象和参数都有大小限制。下面列出了它们。其中一些可以很容易地改变，而另一些则更基本。|4554888|4554889|标签63八位字节/字符或更少|4554890|名称255八位字节/字符或更少|4554891|4554892|它们的工作级别是：|4554893|八位字节标签：61+octets.|4554894|Names：253+|unordered-list-item|4554895|4554896|4554897|4554898|这是因为+(1982年8月发布)定义了user@domain.com格式的电子邮件，user的最小值是一个字符。这将为@留下一个字符，然后您将只剩下用于domain.com部件的253字符。|4554899|这一点得到了无数次的确认。|4554900|4554901|+(1997年7月发布)：只是一个建议的标准。“一个完整的域名限制为255个八位字节(包括separators)."|4554902|4554903|4554904|+(发布于2005年1月)：公认的互联网标准。"URI生成器应使用符合DNS语法的名称，即使使用DNS不是很明显，并且应将这些名称的长度限制为不超过255个字符。“|4554905|4554906|4554907|+(发布于2008年10月)：仅仅是一个提议的标准。此RFC给出标签或子域的最大长度为64，比63的其他域多一个。我建议坚持使用63。“域名或数字的最大总长度是255个八位字节。”|4554908|4554909|每个标签(或子域)可以有63个字符，每个名称可以有255个字符(包括TLD)。|4554910|请注意，它给出的定义是二进制八位数。这是因为它查看的是物理字节，而不是文字字节。例如，\.被解释为.+(一个文字字节)，因为\对它进行了转义，但它被编码为\.+(两个物理字节)。这些八位字节限制是物理字节限制。|4554911|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Internet_Standard#:%257E:text=An%2520Internet%2520Standard%2520is%2520characterized,that%2520was%2520discontinued%2520in%25202011.^0|0|0|7|2|7|2|0|0|0|3|3|3|3|0|0|0|0|K|H|0|0|0|0|0|2|2|0|2|3|0|0|0|7|2|7|2|0|6|3|6|3|0|0|0|0|J|F|16|4|1N|1|24|A|2H|3|0|0|0|0|0|0|0|0|0|17|2|1B|2|1S|2|0|0|0|17|2|1D|1|1Q|1|25|2|0^^$0|@$1|2|3|4|5|6|7|28|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|29|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|2A|8|@$F|2B|G|2C|H|I]|$F|2D|G|2E|H|J]]|9|@]|A|$]]|$1|K|3|L|5|M|7|2F|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|2G|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|2H|8|@$F|2I|G|2J|H|I]|$F|2K|G|2L|H|J]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|2M|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|2N|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|2O|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|2P|8|@]|9|@$F|2Q|G|2R|1|2S]]|A|$]]|$1|X|3|-4|5|6|7|2T|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|M|7|2U|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|2V|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|2W|8|@$F|2X|G|2Y|H|J]]|9|@]|A|$]]|$1|13|3|14|5|6|7|2Z|8|@$F|30|G|31|H|J]]|9|@]|A|$]]|$1|15|3|-4|5|6|7|32|8|@]|9|@]|A|$]]|$1|16|3|17|5|6|7|33|8|@]|9|@]|A|$]]|$1|18|3|19|5|6|7|34|8|@$F|35|G|36|H|I]|$F|37|G|38|H|J]]|9|@]|A|$]]|$1|1A|3|1B|5|1C|7|39|8|@$F|3A|G|3B|H|I]|$F|3C|G|3D|H|J]]|9|@]|A|$]]|$1|1D|3|L|5|1C|7|3E|8|@]|9|@]|A|$]]|$1|1E|3|-4|5|6|7|3F|8|@]|9|@]|A|$]]|$1|1F|3|-4|5|6|7|3G|8|@]|9|@]|A|$]]|$1|1G|3|1H|5|6|7|3H|8|@$F|3I|G|3J|H|J]|$F|3K|G|3L|H|J]|$F|3M|G|3N|H|J]|$F|3O|G|3P|H|J]|$F|3Q|G|3R|H|J]]|9|@]|A|$]]|$1|1I|3|1J|5|6|7|3S|8|@]|9|@]|A|$]]|$1|1K|3|-4|5|6|7|3T|8|@]|9|@]|A|$]]|$1|1L|3|1M|5|1C|7|3U|8|@]|9|@]|A|$]]|$1|1N|3|-4|5|6|7|3V|8|@]|9|@]|A|$]]|$1|1O|3|-4|5|6|7|3W|8|@]|9|@]|A|$]]|$1|1P|3|1Q|5|1C|7|3X|8|@]|9|@]|A|$]]|$1|1R|3|-4|5|6|7|3Y|8|@]|9|@]|A|$]]|$1|1S|3|-4|5|6|7|3Z|8|@]|9|@]|A|$]]|$1|1T|3|1U|5|1C|7|40|8|@$F|41|G|42|H|J]|$F|43|G|44|H|J]|$F|45|G|46|H|J]]|9|@]|A|$]]|$1|1V|3|-4|5|6|7|47|8|@]|9|@]|A|$]]|$1|1W|3|1X|5|6|7|48|8|@]|9|@]|A|$]]|$1|1Y|3|1Z|5|6|7|49|8|@$F|4A|G|4B|H|J]|$F|4C|G|4D|H|J]|$F|4E|G|4F|H|J]|$F|4G|G|4H|H|J]]|9|@]|A|$]]|$1|20|3|-4|5|6|7|4I|8|@]|9|@]|A|$]]]|21|$22|$5|23|24|25|A|$26|27]]]]

<h1>TLDR Answer</h1>
Use these limits:
<blockquote>
Labels: <code>61</code> octets.
Names: <code>253</code> octets.
</blockquote>
Many applications will work even if you exceed these limits (like Gmail), but there are many older applications that will not.
<h1>Source</h1>
<a href="https://www.rfc-editor.org/rfc/rfc1035" rel="nofollow noreferrer">RFC1035: Domain Names - Implementation And Specification</a> (published November 1987), an accepted <a href="https://en.wikipedia.org/wiki/Internet_Standard#:%7E:text=An%20Internet%20Standard%20is%20characterized,that%20was%20discontinued%20in%202011." rel="nofollow noreferrer">Internet Standard</a>, gives the following limits to subdomains and to the entire domain length when viewed in a browser...
<blockquote>
Various objects and parameters in the DNS have size limits. They are
listed below. Some could be easily changed, others are more
fundamental.
labels <code>63</code> octets [bytes/characters] or less
names <code>255</code> octets [bytes/characters] or less
</blockquote>
The working level of these are:
<ul>
<li>Labels: <code>61</code> octets.</li>
<li>Names: <code>253</code> octets.</li>
</ul>
That's because <a href="https://www.rfc-editor.org/rfc/rfc821" rel="nofollow noreferrer"><code>RFC821</code></a> (published August 1982) defines emails in the format of <code>user@domain.com</code>, and the smallest value for <code>user</code> would be one character. That leaves one character for <code>@</code>, and then you only have <code>253</code> characters left for the <code>domain.com</code> part.
This was reconfirmed numerous times...
<ul>
<li><a href="https://www.rfc-editor.org/rfc/rfc2181" rel="nofollow noreferrer">RFC2181: Clarifications to the DNS Specification</a> (published July 1997) : Only a proposed standard. &quot;A full domain name is limited to 255 octets (including the separators).&quot;
</li>
<li><a href="https://www.rfc-editor.org/rfc/rfc3986" rel="nofollow noreferrer">RFC3986: Uniform Resource Identifier (URI): Generic Syntax</a> (published January 2005) : Accepted Internet standard. &quot;URI producers should use names that conform to the DNS syntax, even when use of DNS is not immediately apparent, and should limit these names to no more than 255 characters in length.&quot;
</li>
<li><a href="https://www.rfc-editor.org/rfc/rfc5321" rel="nofollow noreferrer">RFC5321: Simple Mail Transfer Protocol</a> (published October 2008) : Only a proposed standard. This RFC gives the max length of label or subdomains to be <code>64</code>, one more than the others of <code>63</code>. I recommend sticking with <code>63</code>. &quot;The maximum total length of a domain name or number is 255 octets.&quot;
</li>
</ul>
You may have 63 characters per label (or subdomain) and 255 characters per name (this includes the TLD).
Notice that it gives the definition in octets. That's because it's looking at physical bytes, not literal bytes. For instance, <code>\.</code> is interpreted as <code>.</code> (one literal byte), because the <code>\</code> escapes it, but it is encoded as <code>\.</code> (two physical bytes). These octet limits are physical byte limits.

What is the maximum length of the 'name' part in a domain?
I'm referring to the <code>google</code> in <code>http://www.google.com</code>. How long can the <code>google</code> part be without what's before and after it?

Maximum length of a domain name without the http://www. & .com parts

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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域名中“name”部分的最大长度是多少？我指的是http://www.google.com中的google。没有之前和之后的东西，google部件还能存在多久？

问不带http://www.的域名最大长度.com部件(&W)
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回答 5

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