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Are umlauts or digits allowed as (or within) domain names?

Whether you can use umlauts in domains or register a domain that consists only of digits, depends on the respective top-level domain (TLD). The easiest way to check if an umlaut or digits domain can be registered with your desired TLD is to use our domaincheck. On the detail page of the respective TLD you will find even more interesting information about your desired domain.