Referrers are statistics we collect to help you analyze the traffic coming to your maps.
A single referrer is a record of a visitor who came from another site: if the visitor is using a map you’ve embedded on mywebsite.com, the referrer will be mywebsite.com.
Due to some technical restrictions of the web and the behavior of corporate networks, the list can have some confusing entries:
unknown is written for when a request for a map comes without any trace of where it comes from. This could mean the map is being used by a mobile client, or the visitor has turned off referrers on their browser.
localhost means that the map is accessed from someone’s local computer, often for web development and testing. This can also show up as 127.0.0.1.
a.tiles.mapbox.com and mapbox.com will show up when maps are used with Mapbox’s iframe embeds and on share pages.
You can view the referrers for all your tokens or a specific token from your Stats page.
For Mapbox Studio Classic and Mapbox Editor projects, you can view the referrers for a specific project or style by clicking the icon from your Classic page.