What is the format of a second-level domain name? How do I set up a second-level domain name?

Many people new to domain names aren't sure what a second-level domain is, nor do they know the correct format for it. Let's learn about the correct format for a second-level domain!

1. What is a second-level domain?

A second-level domain is a subdomain opened under an international top-level domain. Management authority belongs to the administrator of the top-level domain. An unlimited number of second-level domains can be added and used. For example, www.xxx.com is a second-level domain opened under a top-level domain.

2. What is the format of a second-level domain?

First, a domain name can only contain the 26 English letters, the ten numbers "0-9," and the hyphen "-." (-.), but it cannot begin or end with a hyphen.

Domain names are case-insensitive, but there are certain length restrictions. Chinese domain names are limited to 26 valid characters (Chinese characters, English letters a-z, A-Z, numbers 0-9, and "-" each count as one character). Domain names cannot be purely English or numeric, and must contain at least one Chinese character. "-." cannot appear consecutively.

Generally, the correct top-level domain name is: http://abc.com, and the second-level domain name is: http://www.abc.com.

3. How to set up a second-level domain name?

To add a second-level domain name, you need to have management permissions for the top-level domain name. Log in to your domain registrar's member center. Navigate to Domain Name Resolution > Add Record > Host Record and enter the pinyin name of the second-level domain you want to enable. The record type should be A record, and the record value should be the IP address to which the second-level domain name should resolve. The default TLL value is 600. Click Save. Then bind the second-level domain name to your hosting or server. After registering the top-level domain name, the second-level domain name no longer needs to be registered and can be accessed directly.