The present disclosure relates to determining domain names of a group entity using electronic activities and systems of record. A method can include maintaining a plurality of node profiles including one or more node field-value pairs. Each node profile of the plurality of node profiles can identify a group entity. The method can include identifying a first domain name corresponding to the group entity. The method can include accessing a plurality of data points corresponding to a subset of the plurality of node profiles. The method can include updating each respective node profile of the subset to include a respective second electronic account identifier corresponding to the node profile. The method can include storing, in at least one first data structure, an association between the group entity, the first domain name, and a second domain name corresponding to the second electronic account identifiers.