Bring your domains to 1&1 IONOS, move them between 1&1 IONOS contracts, or prepare a domain transfer to another provider.
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Bring one or more domains from another provider to 1&1 IONOS.
Transfer your domain between your 1&1 IONOS contracts to use with another 1&1 IONOS 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.