Cookie Policy

The websites of The  Open Networking Foundation and its open source projects (collectively, the “Sites”) use cookies, in combination with pixels, local storage objects, and similar devices (collectively, “cookies” unless otherwise noted) to distinguish you from other users of the Sites. This helps us provide you with a good experience, improve our service, and personalize ads and content that may be delivered to you while you use the Sites.   This cookie policy (“Cookie Policy”) describes the types of the cookies we use on the Sites and our purposes for using them. If you have questions about this Cookie Policy, please contact us at For a more complete description and a list of third party cookies that we currently use on the Sites, please see below. For more information about our privacy practices, please review our Privacy Policy. We may update this Cookie Policy from time to time, so please check back periodically.  

Your Consent

Your consent to placement of cookies on your computer by us and our third party service providers. Please read this Cookie Policy carefully for details about why we use cookies and the information they collect from and about you.  

Withdraw Your Consent at Any Time

If you do not wish to accept cookies in connection with your use of the Sites, you will need to delete, and block or disable cookies via your browser settings; see below for more information on how to do this. Please note that disabling cookies will affect the functionality of the Sites, and may prevent you from being able to access certain features on the Sites.  

What Is a Cookie?

A cookie is a small file of letters and numbers that we store on your browser or the hard drive of your computer. Unless you have adjusted your browser setting so that it will refuse cookies, our system will issue cookies as soon as you visit the Sites.  

Key Concepts

First and third-party cookies: whether a cookie is ‘first’ or ‘third’ party refers to the domain placing the cookie.

  • First-party cookiesare those set by a website that is being visited by the user at the time (e.g., cookies placed by
  • Third-party cookiesare cookies that are set by a domain other than that of the website being visited by the user. If a user visits a website and another entity sets a cookie through that website, this would be a third-party cookie.

Persistent cookies: these cookies remain on a user’s device for the period of time specified in the cookie. They are activated each time that the user visits the website that created that particular cookie.


Session cookies: these cookies allow website operators to link the actions of a user during a browser session. A browser session starts when a user opens the browser window and finishes when they close the browser window. Session cookies are created temporarily. Once you close the browser, all session cookies are deleted.


How to Delete and Block our Cookies

Most web browsers allow some control of most cookies through the browser settings. However, if you use your browser settings to block all cookies (including essential cookies), you may not be able to access all or parts of the Sites. Unless you have adjusted your browser setting so that it will refuse cookies, our system will issue cookies as soon as you visit the Sites.   Changing your Cookie Settings.  The browser settings for changing your cookies settings are usually found in the ‘options’ or ‘preferences’ menu of your internet browser. In order to understand these settings, the following links may be helpful. Otherwise you should use the ‘Help’ option in your internet browser for more details.   More information. To find out more about cookies, including how to see what cookies have been set and how to manage and delete them, visit or  

What Cookies Do We Use and Why?

Generally the Sites use cookies to distinguish you from other users of the Sites. This helps us to provide you with a good experience when you browse the Sites and also allows us to improve them. The cookies we may use on the Sites may be categorized as follows:
  • Strictly necessary
  • Performance
  • Functionality
Some cookies may fulfill more than one of these purposes.   ‘Strictly Necessary’ cookies let you move around the Sites and use essential features like secure areas. Without these cookies, we cannot provide the requested services. We use these Strictly Necessary cookies to:
  • Identify you as being logged in to the Sites and to authenticate you
  • Make sure you connect to the right service on our Sites when we make any changes to the way it works
  • For security purposes
Accepting these cookies is a condition of using certain functionality of the Sites, so if you prevent these cookies we can’t guarantee how the Sites or the security on the Sites will perform during your visit.   ‘Performance’ cookies collect information about how you use the Sites, e.g. which pages you visit, and if you experience any errors. These cookies do not collect any information that could identify you and are only used to help us improve how the Sites work, understand what interests our users and measure the effectiveness of our advertising. We use performance cookies to:
  • Carry out web analytics: Provide statistics on how the Sites are used
  • Obtain data on the number of users of the Sites that have viewed a part of the Sites
  • Help us improve the Sites by measuring any errors that occur
  • Test different designs for the Sites
Some of our performance cookies are managed for us by third parties.   ‘Functionality’ cookies are used to provide services or to remember settings to improve your visit. We use ‘Functionality’ cookies for such purposes as:
  • Remember settings you’ve applied such as layout, text size, preferences and colors
  • Remember if we’ve already asked you if you want to fill in a survey
  • Remember if you have engaged with a particular component or list on the Sites so that it won’t repeat
  • Show you when you’re logged in to the Sites
  • To provide and show embedded video content
Some of our functionality cookies are managed for us by third parties.  

Additional Information About Third Party Analytics in use on the Sites

Facebook Connect. For more information about what Facebook collects when you use Facebook buttons on the Sites or visit pages on the Sites that include these buttons, please see:   Twitter. For more information about what Twitter collects when you use Twitter buttons on the Sites or visit pages on the Sites that include these buttons, please see:   LinkedIn. For more information about what LinkedIn collects when you use LinkedIn buttons on the Sites or visit pages on the Sites that include these buttons, please see:   YouTube. For more information about what YouTube collects when you use YouTube buttons on the Sites or visit pages on the Sites that include these buttons, please see:   Google+. For more information about what Google collects when you use Google+ buttons on the Sites or visit pages on the Sites that include these buttons, please see:   Google Analytics. Google Analytics is a web analytics service provided by Google, Inc. (“Google”). For more information about Google Analytics cookies, please see Google’s help pages and privacy policy:   Google’s Privacy Policy Google Analytics Help pages   Google has developed the Google Analytics opt-out browser add-on; if you want to opt out of Google Analytics, you can download and install the add-on for your web browser here.   Google uses cookies to help us analyze how users use the Sites. The information generated by the cookie about your use of the Sites (including your IP address) will be transmitted to and stored by Google on servers in the United States. In case of activation of the IP anonymization, Google will truncate/anonymize the last octet of the IP address for Member States of the European Union as well as for other parties to the Agreement on the European Economic Area. Only in exceptional cases, the full IP address is sent to and shortened by Google servers in the USA. On behalf of the Sites, Google will use this information for the purpose of evaluating your use of the Sites, compiling reports on your activity for us and third parties who help operate and provide services related to the Sites. Google will not associate your IP address with any other data held by Google. You may refuse the use of these cookies by selecting the appropriate settings on your browser as discussed in this notice. However, please note that if you do this, you may not be able to use the full functionality of the Sites. Furthermore you can prevent Google’s collection and use of data (cookies and IP address) by downloading and installing the browser plug-in available at   Further information concerning the terms and conditions of use and data privacy can be found at or at  

More Information About Cookies

Internet Advertising Bureau A guide to behavioral advertising and online privacy that has been produced by the internet advertising industry can be found at   International Chamber of Commerce United Kingdom Information on the ICC (UK) UK cookie guide can be found on the ICC website section at   THIRD PARTY COOKIE LIST
DomainTechnical NamePurpose
.twitter.com_twitter_sess ct0 external_referer gt tfw_expThese cookies, provided by Twitter, are used in conjunction with social media plugins in order to allow those following our Twitter accounts to easily, share content via Twitter, and to display the latest tweet. Twitter makes use of cookies to improve its own service, to personalize content and enable additional features or logged-in Twitter users, and to target Twitter ads.
.twitter.comguest_idUsed to identify you to Twitter. If you do not have a Twitter account or never accessed the website directly then Twitter will assign you a unique code to track your visit to the Twitter feed.
.twitter.compersonalization_idUsed by Twitter if you are logged in to Twitter to associate your device with your Twitter account. Twitter may also use this cookie for personalization across devices whether or not you are logged in to Twitter.
.twitter.comsyndication_guest_idUsed by Twitter to collect information about users’ browsing behavior for marketing purposes, including digital display and social media advertising.