To point your 1and1 domain to your website, you'll need to update two specific records in your domain management panel: the A record and the CNAME record.
Access Your Account: Log in to your 1and1 account.
Navigate to Domains: Click the Administration tab and select Domains.
Edit DNS Settings:
Find the domain you wish to connect and click the downward-pointing arrow.
Select Edit DNS Settings.
Configure the A Record:
Select Other IP address.
In the IP address field, enter 166.117.120.15 and click Save.
Create a Subdomain:
Click New and then Create Subdomain.
Enter www and click OK.
Configure the CNAME Record:
Select the checkbox next to the newly created www subdomain.
From the DNS menu, select Edit DNS Settings.
Select CNAME.
In the Alias field, enter global-v1.loadweb.com and click OK.
Service Updates: Since 1&1 Ionos is an external provider, their interface and specific steps may evolve as they update their services.
Propagation: Keep in mind that DNS changes typically take some time to process across the web.