Google Analytics Tag Usage and History

Domain First Detected Last Detected October-13 March-17 October-13 October-13 October-13 October-13 December-13 December-13 September-14 April-15 May-16 March-17 July-16 July-16 July-16 July-16 October-16 November-17 December-16 November-17 March-17 November-17 July-17 November-17 July-17 August-17

Relationship data is generated by looking at the historical usage of identifiers which are generally shared between websites owned/controlled by the same company/individual.

Automate lookups to website relationships via the Relationships API.