List of cookies we use

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First party cookies

List of cookies created by IET web domains


When you are not logged in, most IET sites use cookies to manage your session. You may block these if you wish, but some functions may not work fully; for example, you will not be able to page through results in the events calendar. The IET does not use these cookies to monitor your behaviour; they exist only to provide you with site functionality. The book shop also uses your existing site cookies to keep track of the contents of your shopping basket, rather than setting additional ones. Without accepting cookies, you will not be able to use the shop.

Cookie set by Adobe ColdFusion applications. Used in conjunction with CFTOKEN this cookie helps to uniquely identify a client device (browser) to enable the site to maintain user session variables. How those are used are specific to the site. CFID contains a sequential number to identify the client. The main purpose of this cookie is: Strictly Necessary

Third party cookies

A third-party cookie is one that is placed on a user's hard disk by a Web site from a domain other than the one a user is visiting. 


Third party widget that presents a selection of social sharing links to users and also provides publishers with in-depth analytics


__atuvc stores an updated page share count

__atuvs displays counter to user if page is shared with the selected social-sharing service

b2 records visited pages in a site in order to recommend other pages in that site


loc Geolocation, which is used to help providers determine how users who share information with each other are geographically located (state level).




uvc Records how often AddThis encounters the same user IP address

Google Analytics

Third party web analytics service


__utma records whether the visitor came from a search engine (and if so, the search keyword used), a link, or from no previous page (e.g. a bookmark).

















Olark live chat software

Instant message web communication


_ok  contains a site identifier, used for security purposes

_okbk contains software state information


_oklv  used to improve caching of software


_pinterest_cm - Enables users to follow the IET 'pinboard' 


We use Siteimprove cookies to help us identify content presentation issues such as broken links and prioritise remedial action where there may be multiple instances to correct.


__cfduid  - records and relays back a count of clicks on broken links