If you are running hosting company most likely you would want to provide your customers temporary link to access their site before actuall domain propagation. This is especially useful when customer is moving site from another host and want to check if everything works as expected.
For instance, you have 2 IP addresses on a server, 192.168.3.57 and 192.168.3.58. Let’s say your site is tophost.ltd. Then you need to set up 2 wildcards for each ip address. Go to the DNS menu. Click on a “add record” under the tophost.ltd domain and enter following
Press Add button and add second record
The DNS part is complete. Let’s assign those domains to corresponding ip addresses. Go to the IP menu. Select 192.168.3.57. Click on edit button opposite and add alpha.tophost.ltd in the “Assigned Domain” text field. Save and repeat accordingly for the 192.168.3.58 address and beta.tophost.ltd domain.
Now when your user add new domain it will automatically get tophost alias. If he added bbc.com on a 192.168.3.57 then he will be able to see his domain by opening http://bbc-com.alpha.tophost.ltd As you can see dots in original domain has been replaced with dashes.