We license reference data from a mix of providers, both public and private, and we prioritize data accuracy and cost in all of our data licensing activities.  Most address reference data is licensed from postal operators in each country, however we also use private data providers and third party software components to supplement those data sets.
Referential data is updated as frequently as possible, typically on a monthly basis for most data sources.  Data updates are managed by our product team and are completely invisible to the customer.  We always ensure that the most complete and most current data we have is in production immediately.
The data landscape is rapidly evolving, and we’re constantly evaluating existing and new sources of data to improve our products.