tree*
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If you want to use Public User Enum you need to be eligible user of number(s) and register you number or prefix by registrator in country where the number belongs. You eligibility is validated by special process that is not done in case of common domains. Validation procedure depends on your registrator.
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*nrenum.net - Private NREN tree*
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nrenum.net is an effort of National Research and Education Networks (NREN) and provides nrenum.net provides countries, where the Golden ENUM Tree (e164.arpa) is not (yet) available, with the possibility to publish ENUM data. The nrenum.net tree is queried by the participating partners in case no ENUM data is found in the Golden Tree.
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See \[[http://nrenum.net/|nrenum.net]\] for more infromation.