Bring your domains to 1&1, move them between 1&1 contracts, or prepare a domain transfer to another provider.
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Bring one or more domains from another provider to 1&1.
Transfer your domain between your 1&1 contracts to use with another 1&1 product or if you want to keep the domain but cancel its contract.
Move your domain to another provider to use the domain with their products/services.
The document can be reached at this web address:
The new 1&1 Help Centre with instructions and information about our domain products and services.
Help with Additional 1&1 Products