They don't retain IP addresses beyond 48 hours but they may retain other information (permanently). For example, the domain requested, your ISP and your approxi

They don't retain IP addresses beyond 48 hours but they may retain other information (permanently). For example, the domain requested, your ISP and your approximate location (city or region). https://developers.google.com/speed/public-dns/privacy https://developers.google.com/speed/public-dns/privacy So, while it can't be traced back to you, it is absolutely useful information for their business. Why do you think they offer the service? To be nice?