What do you mean by URL suffix letters?

What does the suffix letter mean? Every time we browse a website, enter the detailed URL of the interface will appear a few more small letters. Do you know what the suffix letters mean? Below, Teng NIU net small set for everyone popular science hidden in the URL suffix letters in the small secret.

When we want to browse a website, just enter the detailed URL in the browser. Take a chestnut, when the input www.cfan.com.cn, but in the browser's address bar appears in the http://www.cfan.com.cn/.

Small knitting Here simply explained: In the browser's address bar entered the website address is called the URL (uniform Resource Locator, Uniform Resource Locator). Just as every household has a home address, every page has an Internet address. When you enter a URL in the browser's address box or click a hyperlink, the URL determines the address you want to browse.

Browsers use Hypertext Transfer Protocol (HTTP) (Internet security requirements, using HTTPS page also began a large area of application), the Web server site on the page code extracted, and translated into a beautiful web page. Therefore, before we know HTTP, it is necessary to clarify the composition of the URL, to the fan's web page http://www.cfan.com.cn/technic/as an example, it represents:

　　http:// : Represents a Hypertext Transfer protocol that notifies the cfan.com server to display Web pages, usually without input;

　　www : Represents a Web (WWW) server;

　　cfan.com.cn/ : This is the name of the server that contains the Web page, or the site server;

　　technic/ : A subdirectory on the server, just like the various folders in our computer.

Introduced so much, today mainly want to talk to you and "CN" related to those things ...

The site's domain name, now mainly divided into such a few categories:

　　The first category is the generic top-level domain name (general top level domain, abbreviated GTLD)

Mainly include:

1. com on behalf of commercial organizations

2. NET represents network organization

3. org represents a total of 22 generic top-level domains, including non-profit organizations.

　　#FormatImgID_2 #

　　The second category is the national and regional code top-level domain name (country code top level domain, referred to as ccTLD)

Mainly include:

1,. cn China Domain name (we cfan the net belongs to this kind)

2. US U.S. domain name

3,. HK UK domain name and so on altogether 308 country domain names

　　The third category is the new generic top-level domain name that has been added since the 2011 "New generic top-level domain name" program, (new Generic top-level domain, short for new GTLD)

Mainly include:

1. Bike Bicycle domain name

2. Car Domain name

3. Run running domain name 六、七百个 new top-level domain

(The new domain name is very many, basically as long as can pass approval can appear in the network)

It can be said that the ccTLD domain suffix is the shortest of all domain name suffixes. Now a total of 247 two-letter domain name suffix, accounting for all the domain name suffix of 18%, and all of these two-letter domain name suffix has a common feature, all the two-letter end of the top-level domain name is the country's top domain name, or more accurately called the country code top-level domain name.

These two-letter domain suffix is determined by the International Organization for Standardization Iso3166-1 International standards, the standard is the first part of ISO3166. There are currently 247 internationally recognized countries and regions listed in the "ISO 3166-1" code table, so the two-letter suffix has exactly 247 different regions of the world, no more and no less.

There are now 1374 domain names for the IANA (the world's governing domain name agency).

Includes generic top-level domain names, such as. Com,.net and so on before the mainstream domain suffix.

State-level domain names, such as. cn,.us, which represent the country's domain name suffix.

New top-level domain names, such as. XIN,.VIP, new open registration suffix for the last few years.

The domain name length is also from 2 letters (excluding. URL,. Chinese exotic domain names, just say two letters) to 19 letters. (Tomorrow domain navigation will continue to introduce the 19-letter flower name suffix, welcome attention). A two-letter (two-character) domain suffix is also the shortest of all domain name suffixes.

According to statistics, now a total of 247 two-letter domain name suffix, accounting for all the domain name suffix of 18%, and all of these two-letter domain name suffix have a common feature.

All two-letter end of the top-level domain name is the country's top-level domain name, or more accurately known as the country code top-level domain. The 247 two-letter domain suffix corresponds to 247 countries or regions.

So how do these two-letter domains correspond to countries?

These two-letter domain suffix is determined by the International Organization for Standardization Iso3166-1 International standards, the standard is the first part of ISO3166. There are currently 247 internationally recognized countries and regions listed in the "ISO 3166-1" code table.

So the two-letter domain suffix has exactly 247 different regions of the world. Therefore, only in countries or regions such as fragmentation of major changes, it is possible to have a new two-letter domain name suffix.

The code assigned in the code table must be included in the United Nations National name Bulletin or in the country code for statistical use by the United Nations Statistical Office for the inclusion of the following three conditions:

1. Member States of the United Nations

2. Membership of any special body of the United Nations

3. Participation in the Statute of the International Court of Justice

Now when you want to browse the Cfan website and enter. CN, you already know what this "CN" stands for?