Hello, because when you visit a website, the default is port 80. Once you change it to something else, you must add the port number when you visit. If you want to access a domain name without adding a port number, you can add a second-level domain name, and then hide the WWW record and set the later item as: 8 1, so that when you visit www.xxx.com, the domain name server will automatically turn for you.

It doesn't really make much difference. In this case, you need to add the port number when accessing.