Updated February 2018. Note, greyed-out cells indicate deprecated
| Name | Domain | Type of content | Purpose | Lifespan | Originator |
| cd | .rubiconproject.com | Boolean | Indicates whether cookies are disabled for the device. | 1 year | Fastlane |
| cimg* | .rubiconproject.com | Ad serving details | Contains information about served ads (timestamp, site, internal identifiers for the publisher, buyer, advertiser, and displayed advertisement). | 1 hour | Delivery |
| c | pixel.rubiconproject.com | Boolean | Used for testing whether 3rd party cookies are enabled or not | Browser session | Data Engine |
| FPTrust | .rubiconproject.com | Boolean | NAI opt-out process | Browser session | Data Engine |
| au | .rubiconproject.com | Internal ID | Internal user identifier used for internal analytics. Not used for purposes of | 1 year | OZ |
| khaos | .rubiconproject.com | Internal ID | Internal user identifier used for internal analytics. | 1 year | Data Engine |
| rsid | .rubiconproject.com | Device information | Session cookie that contains demographic information about a device, including region (derived from IP address, not geolocation data), Operating System, browser, etc., that is used during thek auction process. | Browser session | Delivery |
| trp_optout | .rubiconproject.com | True if opted-out | Cookie indicating that a user has opted-out of behavioral targeting marketing | 5 years(1827 days) | Data Engine |
| fcap | secure-assets.rubiconpro ject.com | List of partner IDs, count for each, and timestamp | Frequency cap on calls out to sync.php, limiting to N per Exchange API partner per day | 30 days | Solution Engineering |
| put_* | .rubiconproject.com | Bidder ID | Bidder identifiers placed at the request of a bidder, to sync a bidder’s independent information about an end user with Rubicon Project, to allow the bidder (not Rubicon Project) to bid on ads through the Rubicon Project advertising exchange based on behavioural targeting information known | 1 month 1 day (can be modified by bidder) | Data Engine |
| only to the bidder (i.e., the value of this cookie will be transmitted in a Bid Request to the bidder that caused this cookie to be placed). | |||||
| pux | .rubiconproject.com | Expiration dates | Dates for when information in the put_* and sput cookies expires and should be refreshed. | 90 days | Fastlane |
| rpb | .rubiconproject.com | Audience Targeting | Publisher and partner-owned audience segments used for private marketplaces and audience-based planning and forecasting in Orders. | 30 days | Data Engine |
| rpx, rpx_* | pixel.rubiconproject.com | Expiration dates | Contains expiration dates for information in the rpb cookie. | 30 days | Data Engine |
| sput, sput_* | .rubiconproject.com | Bidder IDs | Contains multiple bidder identifiers (i.e., data that would be stored in multiple put_* cookies) in a smaller number of cookies. | 180 days | Data Engine |
| ruid | .rubiconproject.com | Internal ID | User identifier shared with bidders in Bid Requests, to allow bidders to sync to any independent behavioural data they may have gathered about the relevant device. | 180 days | Data Engine |
| ses* | .rubiconproject.com | View count | Indicates number of times Rubicon Project has served a user an advert for this particular unit of inventory. | Current day UTC | Delivery |
| vis* | .rubiconproject.com | Visit count | Indicates number of times this user has initiated an ad request for this particular unit of inventory. | Current day UTC | Delivery |
| dq | tap.rubiconproject.com | Data Quality | Provides a measure of "data quality" on a particular device. | 1 year | OZ |
