To be sure the change was successful, click the Go To Overview button. Please remember that it can take 24 to 48 hours for your domain name to fully propagate after you make these changes. You now know how to update your DNS settings by changing them to our name servers, when your domain name is registered with 1and1This script monitors the server's external ip address for changes.You received our nameserver settings in the welcome email that was sent to you when you purchased your hosting package with us.There are two or more nameserver (NS) settings, and they must each be changed. Click on the Customer Login link at the top of the page. Select the domain you wish to manage from the pull-down list, and click on the Next button. Go down the page to Name Server Settings, and click on Edit.Now click on the OK button at the bottom of the page. Scroll back up to the top of the page, and click on the Logout button in the right hand corner.This will take you to a screen that will confirm that the process is completed, and the DNS settings have been saved, and your domain will be updated accordingly. The settings have been successfully updated, and your domain is now pointing to your new hosting account on our servers.Instead you simply allow your website platform (such as Wordpress Multisite) to recognize the subdomain used, and load the correct website.Because the wildcard A record is only set for domains residing in server packages, platforms such as Wordpress Multisite will not operate properly on a standard hosting package.
The DNS settings can always be altered after the domain has been registered to point to a different IP address, mail servers, or even change the DNS altogether (DNS Transfer or CNAME).
Normally you would have to manually create each subdomain in the 1&1 Control Panel, so that the subdomain would be assigned the default DNS settings and work properly.
With the wildcard A record set, there is no need to create each subdomain manually.
If you are only able to access your mail server via its IP address, you must enter an IP address for your domain's MX Record instead.
Changing your MX Records will change the servers which route your incoming mail.