The dataset contains snapshots taken within a timeframe of maximum 8 hours each. New snapshots will be added as additional data is collected. The forward DNS requests are made with record type 'ANY' which results in all kinds of result records being returned. The first upload contained only the following types: A, AAAA, CNAME, MX, NS, PTR, SOA, TXT. Since then we've changed the parsing library (ldns) and are now uploading all records we retrieve, as far parsed as possible. The data might contain unknown record types and known but incorrect ones next to all the different parsed types.