Cookie Table
Slack Cookie Tables
We are providing this list to give you transparency into the cookies and similar technologies used by Slack. While Slack’s technologies may be updated, the following tables provide brief descriptions of the key technologies used on Slack sites.
This table may be updated from time to time. Please take a look at our Cookie Policy if you'd like more information on how and why we use cookies.
Performance, Analytics, Research, and Marketing
The following are third-party cookies.
| Domain | Cookie Name | Expiration | Description | Opt-Out |
|---|---|---|---|---|
| third party | __ar_v4 | 5 years | Advertising (Google DoubleClick) | Google Opt-Out |
| third party | IDE | 2 years | Targeting/ Advertising (Google DoubleClick) | Google Opt-Out |
| third party | lidc | 1 day | Advertising and Share buttons (LinkedIn) | LinkedIn Opt-Out |
| third party | fr | 3 months | Advertising (Facebook / Facebook Pixel) | Facebook Opt-Out |
| third party | B | 9 years | Advertising (Yahoo) | Yahoo Opt-Out |
| third party | ATN | 2 years | Advertising (Facebook – Atlas Solutions) | Facebook Opt-Out |
| third party | lang | Session | Advertising (LinkedIn) | LinkedIn Opt-Out |
| third party | BizoID | 6 months | Advertising and LinkedIn insights (LinkedIn) | LinkedIn Opt-Out |
| third party | UserMatchHistory | 6 months | Advertising and LinkedIn insights (LinkedIn) | LinkedIn Opt-Out |
| third party | __zlcmid | 1 year | Live chat widget on Slack contact page (ZopIM) | ZendDesk Privacy Policy |
| third party | _ga | 2 years | Analytics used to distinguish users (Google Analytics) | Google Opt-Out |
| third party | _gid | 24 hours | Analytics used to distinguish users (Google Analytics) | Google Opt-Out |
| third party | _gat | 1 minute | Analytics used to throttle request rate (Google Analytics) | Google Opt-Out |
| third party | cvo_sid1 | 13 years | Marketing (Convertro) | Convertro Privacy Policy |
| third party | cvo_tid1 | 13 years | Marketing (Convertro) | Convertro Privacy Policy |
| third party | __qca | 1 year | Advertising (Quantcast) | Quantcast Opt-Out |
| third party | mc | 1 year | Advertising (Quantcast) | Quantcast Opt-Out |
| third party | driftt_sid | 6 hours | Marketing (Drift) | Drift Opt-Out |
| third party | driftt_aid | 2 years | Marketing (Drift) | Drift Opt-Out |
| third party | optimizelyEndUserId | 6 months | Marketing (Optimizely) | Optimizely Opt-Out |
| third party | optimizelyRedirectData | 6 months | Marketing (Optimizely) | Optimizely Opt-Out |
Internal Cookies & Similar Technologies Used on Slack.com
The following are first-party cookies used on properties including Slack.com and other domains operated by Slack.
| Domain | Cookie Name | Expiration | Description |
|---|---|---|---|
| slack.com | b | 10 years | Visitor Cookie |
| slack.com | c | 10 years | Settings |
| slack.com | d | 10 years | Tracks session you are logged into |
| slack.com | d-s | Session | Timestamp of last authorization. |
| slack.com | lc | 30 days | Timestamp of last authorization change. |
| slack.com | t | 10 years | Settings |
| slack.com | s | Session | Session id cookie |
| slack.com | x | Session | Visitor session cookie |
| slack.com | rc | Session | Referral code for team creation |
| slack.com | ec | 1 hour | E-mail confirmation and code expiration cookie |
| slack.com | i18n_locale | 1 year | Internationalization preferences |
| slack.com | utm | 30 days | Advertising analytics |