List of Known Cookies
This list of cookies is not exhaustive but covers the cookies we are aware of at the time of publication.
|__utma||This is one of the four main cookies set by the Google Analytics service which enables website owners to track visitor behaviour and measure site performance. This cookie lasts for 2 years by default and distinguishes between users and sessions. It it used to calculate new and returning visitor statistics. The cookie is updated every time data is sent to Google Analytics. The lifespan of the cookie can be customised by website owners.||No|
|_gat||This cookie name is associated with Google Universal Analytics, according to documentation it is used to throttle the request rate – limiting the collection of data on high traffic sites. It expires after 10 minutes.||No|
|PHPSESSID||Cookie generated by applications based on the PHP language. This is a general purpose identifier used to maintain user session variables. It is normally a random generated number, how it is used can be specific to the site, but a good example is maintaining a logged-in status for a user between pages.||Yes|
|__utmc||This is one of the four main cookies set by the Google Analytics service which enables website owners to track visitor behaviour and measure site performance. It is not used in most sites but is set to enable interoperability with the older version of Google Analytics code known as Urchin. In this older versions this was used in combination with the __utmb cookie to identify new sessions/visits for returning visitors. When used by Google Analytics this is always a Session cookie which is destroyed when the user closes their browser. Where it is seen as a Persistent cookie it is therefore likely to be a different technology setting the cookie.||no|
|_ga||This cookie name is asssociated with Google Universal Analytics – which is a significant update to Google’s more commonly used analytics service. This cookie is used to distinguish unique users by assigning a randomly generated number as a client identifier. It is included in each page request in a site and used to calculate visitor, session and campaign data for the sites analytics reports. By default it is set to expire after 2 years, although this is customisable by website owners.||No|
|_gid||This cookie name is asssociated with Google Universal Analytics. This appears to be a new cookie and as of Spring 2017 no information is available from Google. It appears to store and update a unique value for each page visited.||No|