What Is a Top Level Domain?

A domain name consists of two or more groups of ASCII or national language characters. Each group of characters is separated by a period. The rightmost character group is called the top-level domain name or first-level domain name, and the penultimate group is called second-level domain name The third to last group is called the third-level domain name, and so on. Top-level domains are divided into three categories: First, country code top-level domains (ccTLDs ^[1] ). Currently, more than 200 countries have assigned top-level domains according to ISO3166 country codes. Japan is jp, etc .; second, generic top-level domains (gTLDs), such as .com for industrial and commercial enterprises, .net for network providers, and .org for non-profit organizations. Third, there are more than a thousand new top-level domain names (New gTLDs) such as generic .xyz, .top for "high-end", .red for "red", and .men for "person" ^[2] .

Top-level domain

The number of levels of a domain name refers to how many levels a domain name consists of, and each level of a domain name is separated by a ".".

TLDs have a dot at the beginning

"

The domain name can only contain the following

The domain name should be concise and easy to remember

This is the most important factor in judging the good or bad domain name. A good domain name should be short and smooth, easy to remember, it is best to remember it at a glance, and it is pronounced clearly without causing spelling errors. In addition, domain name selection should avoid homophones.

Domain names must have a certain meaning and meaning

Using words or phrases with a certain meaning and connotation as the domain name is not only memorable, but also helps to achieve the marketing goals of the enterprise. For example, the name of the company, product name, brand name, brand name, etc. are all good choices, so that the company's online marketing goals and non-Internet marketing goals can be agreed.

Note: Although COM represents a commercial organization, individuals can also register COM domain names. In other words, not all COM domain names are commercial organizations.

Top-level domains such as .NET, ORG are also a reason

Organizations registered according to law and able to independently bear civil liability

1.

English 26 letters and 10 Arabic numerals and the horizontal bar "-" (minus sign) can be used as a domain name. There is no difference in capitalization. However, the domain name cannot exceed 63 characters, and "-" (minus sign) cannot appear at the beginning or end of the string.

ICANN was established in October 1998 to replace NSI

Top-level domain main entry: TLDs, Top-level domains, first-level domains

The domain name that contains your name or company name is easy for users to find and even guess.

In actual use and function, international

The IP address is a digital identifier used by Internet hosts for routing and addressing, which is not easy for people to remember. As a result, a domain name (domain name) is a character identifier.

DNS was first invented by Paul Mockapetris in 1983; the original technical specifications were published in the Draft Internet Standard No. 882 (RFC 882). Drafts 1034 and 1035, issued in 1987, amended DNS technical specifications and repealed previous drafts 882 and 883. Subsequent changes to the draft Internet standard did not involve changes to the DNS technical specifications. DNS is the domain name resolution service.

On July 20, 2018, the Ministry of Industry and Information Technology approved that Baidu Online Network Technology (Beijing) Co., Ltd. became "

2012,

1.

Currently IANA distinguishes top-level domains into the following groups:

Full English name	English abbreviation	Chinese
infrastructure top-level domain	ARPA	Infrastructure TLDs
country code top-level domains	ccTLD	Country and region top-level domains
internationalized top-level domains	iDNs	Internationalized TLDs
internationalized country code top-level domains		Internationalized national top-level domains
testing top-level domains		Testing top-level domains
generic top-level domains	gTLD	GTLD