freenom domain name resolution and sub-domain name

DNS

Log in to the freenom official website > Services > My Domians > Manage Domain > Manage Freenom DNS >

In the Target option, enter the IP that your domain name is bound to, and in the Name option, enter www or other subdomains (nothing is written to represent the top-level domain name).

Just save it; the parsing may take a while, so be patient.

subdomain

Take for  a.net example:

1. What is a first-level domain name : net it is a first-level domain name
2. What is a second-level domain name : a.net it is a second-level domain name
3. xxx.a.netWhy : It's actually a third-level domain name

That is to say, the commonly used second- level domain name should actually be the third-level domain name .

Regarding the use of second-level domain names:

1. Usually we spend money to register second- level domain names , so unless we spend extra money, we tentatively only have one second-level domain name available.
2. So how many websites can this second-level domain name be used to resolve? One.
    
   1. In layman's terms, domain names are used to "interpret" physical addresses - IP, so a second-level domain name can of course only correspond to one website, because each independent website needs at least one physical address to exist on the Internet for people to visit. .
3. When you have a second- level domain name that you can fully control , you can create an unlimited number of third- level domain names , of course their second- level domain names are the same.
    
   1. The third-level domain name can also be used to resolve physical IP addresses, so you can use it on a completely different website than the second-level domain name .
   2. Therefore, you can indeed buy only one second-level domain name , but you can build an infinite number of websites, each of which uses a different third- level domain name .
4. The third-level domain name is not the end, there are fourth- level , fifth -level , ... more available.
    
   1. However, there is no limit to how many domain names can be set at each level, although there is no limit in theory, but in fact, the provider of the domain name can limit it. This point should be paid attention to when purchasing a domain name.

Finally, domain name is a general concept, a second-level domain name is a domain name, and a third-level domain name is also a domain name; specific to each specific domain name, it can only correspond to one host name.

How to say?

a.net, which is a domain name; xxx.a.net, which is also a domain name (although they are at different levels).
a.net, which is a hostname; xxx.a.net, which is also a hostname (they can either resolve to the same host, or they can be different, depending on how you set up the rules for resolving them).