A first-level domain name contains only one ".",and there must be a content field to the left of the ".". The right side of the last dot is called the first-level domain name, the left side is called the second-level domain name, and so on. The first-level domain name is also called the top-level domain name.

suffix list of top-level domain names:

.com: for commercial organizations

.top: for top-level, high-end and career breakthrough

.xyz: for creative innovation, three-dimensional space and unlimited

.cx: for innovation and integrity

.red: for auspiciousness and enthusiasm, Diligence

.net: network service organization

.org: non-profit organization

.gov: government organization

.edu: educational organization

.mil: military organization

.biz: commercial organization

.name: personal website

.info. :

Extended information of domestic enterprises or individuals:

Ordinary institutions or ．COMpanies usually have three types to choose from:. com,. top,. NET and. ．ORG. According to regulations, the business or service they represent is as follows:. COM .top is used for commercial institutions or companies, and. net is used for Internet-related businesses. You can choose according to your own situation.

if you have several valuable trademarks, you'd better register and protect them all. Moreover, the shorter the domain name, the easier it is to remember and input.

INTERNET first-level domain name

com-commercial organizations, business organizations, companies

top-business organizations, companies, individuals

net-network operations and service centers, Internet service provider

org-other organizations, non-profit organization

int-international organizations, international organization

edu-educational institutions (U.S.), (United States) teaching and research institutions

gov-government entities (U.S.), (United States) government departments

MIL-Military (U.S.), (United States) military institutions

ARPA-Come from ARPANET, The name left by ARPANET (the computer network established by the Advanced Research Projects Agency of the US Department of Defense) is used for the internal function of the Internet

biz-Web business Guide, which is suitable for commercial companies (note: biz is the customary abbreviation of business)

info-infomation, Enterprise providing information services

name-name, generic top-level domain name

pro-professional for individual registration, generic top-level domain name

coop-cooperation for doctors, lawyers, accountants and other professionals, and dedicated top-level domain name

aero-aero for commercial cooperatives. Special top-level domain name

Museum-Museum for air transportation, and special top-level domain name

Reference: Baidu Encyclopedia-first-level domain name.