DocumentationCX Enterprise interface and administration

Adobe Experience Platform Web SDK cookies

Last update: October 21, 2026

CREATED FOR:

  • Experienced
  • Admin

The Adobe Experience Platform Web SDK uses cookies to store values specific to your implementation.

Name
Max age
Size
Description
AMCV_###@AdobeOrg
33696000 (390 days) when written by the Web SDK
44 bytes when written by the Web SDK (MCMID|<ECID>); larger when written by VisitorAPI.js
Present when idMigrationEnabled is enabled, which is the default. It helps when transitioning to the Web SDK while some parts of the site still use VisitorAPI.js. The Web SDK reads this cookie to reuse an existing ECID. After the Edge Network returns an ECID, the Web SDK writes it to this cookie if the cookie is missing or contains a different ECID.
com.adobe.alloy.getTld
None (session cookie, immediately deleted)
22 bytes
Temporary helper cookie used internally by the Web SDK to determine the top-level domain of the current site. The Web SDK writes and deletes this cookie when the library loads, before the configure command runs and before consent is evaluated, so cookie scanners can report it as set before consent. The cookie contains only its own name and does not store behavioral or profile data.
demdex
15552000 (180 days)
varies
Third-party cookie on the demdex.net domain. Present when thirdPartyCookiesEnabled is enabled (the default) and the browser allows third-party cookies by default, such as Chrome or Edge. In that case, the Web SDK sends identity requests to adobedc.demdex.net, which sets this cookie. Audience Manager uses this cookie to assign a unique ID and support ID sync, segmentation, modeling, and reporting. See demdex in Audience Manager cookies.
kndctr_<orgId>_identity
34128000 (395 days)
100-120 bytes (variable)
Stores the ECID and other related information for that device.
kndctr_<orgId>_cluster
1800 (30 minutes)
3-5 bytes
Stores the Edge Network region (location hint) that serves the current user’s requests. The region is used in the URL path so that the Edge Network can route the request to the correct region. If a user connects with a different IP address within the cookie lifetime, the request is again routed to the closest region.
kndctr_<orgId>_consent
15552000 (180 days)
10-11 bytes
Stores the visitor’s consent preferences. Always set regardless of consent because it stores the consent preferences itself.
kndctr_<orgId>_consent_check
7200 (2 hours)
Session-scoped helper that signals the Edge Network to re-check consent server-side after the TTL expires. It enforces a TTL on cached consent.
kndctr_<orgId>_personalization
34128000 (395 days)
Stores session information that Adobe Target uses to personalize content.
kndctr_<orgId>_advertising
31622400 (366 days), renewed each time the cookie is updated
80 bytes to 1 KB (variable)
Present when the Adobe Advertising component (beta) is included in your Web SDK build and the visitor’s consent is in. The Web SDK writes this cookie when the page URL contains Adobe Advertising click parameters (s_kwcid or ef_id), or when Adobe Advertising DSP advertisers are configured. It stores URL-encoded JSON that can include search click data (_les_lsc), a hashed IP address, a LiveRamp RampID envelope (when a RampID JavaScript path is configured), and conversion timestamps used to throttle duplicate conversions. In browsers that allow third-party cookies by default, it also stores the Adobe Advertising surfer ID and display click data (ev_lcc). This cookie is set on the current hostname only. The component also loads resources from pixel.everesttech.net, www.everestjs.net (when an ID5 partner ID is configured), and your RampID ats.js path. These resources can set their own cookies, which are not listed on this page.
kndctr_<orgId>_bc_session_id
None (session cookie)
Present when the Brand Concierge component (beta) is used. Stores the Brand Concierge chat session ID. The Web SDK reads this cookie only when stickyConversationSession is enabled, so that chat sessions persist across page loads.
mbox
63072000 (2 years)
Present when targetMigrationEnabled is enabled. It allows the Target mbox cookie to be set by the Web SDK.
mboxEdgeCluster
1800 (30 minutes)
Present when targetMigrationEnabled is enabled. It allows the Web SDK to communicate the correct edge cluster to at.js so that Target profiles can stay in sync as users navigate across a site. When the kndctr_<orgId>_cluster cookie is not present, the Web SDK also reads this cookie to route requests to the matching Edge Network region.
s_ecid
63115200 (2 years)
~45 bytes
Contains a copy of the CX Enterprise ID (ECID/MID) in the format s_ecid=MCMID|<ECID>. Acts as a first-party backup of the ECID, primarily for CNAME (first-party) scenarios. When idMigrationEnabled is enabled, the Web SDK reads this cookie to reuse an existing ECID.
Audience Manager cookie destinations (name varies)
864000 (10 days), unless the destination specifies a different lifetime
varies
Present when the Edge Network returns an Audience Manager cookie destination for the visitor. The Web SDK writes a first-party cookie using the cookie name, value, and domain defined in the destination. Values are URL-encoded, consistent with the Audience Manager Data Integration Library (DIL).

The Edge Network sets all of its cookies with the secure and sameSite="none" attributes. If you currently have both secure and non-secure sections on your website, user identification can be inaccurate. When a user navigates from a secure section of the site to a non-secure section, the Edge Network generates a new ECID with the request.

Cookies that the Web SDK creates on its own, rather than at the direction of the Edge Network, use different attributes. The AMCV_###@AdobeOrg cookie and Audience Manager cookie destinations include the secure and sameSite="none" attributes only on HTTPS pages. The com.adobe.alloy.getTld and kndctr_<orgId>_advertising cookies use the browser’s default attributes.

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