Basics of the DEMDEX Cookie - questions related to cookie attributes

Question

We're coming up on some questions about the DEMDEX cookie, not only initial cookie set but subsequent marketing attributes.

When is the cookie is set for a new visitor? Upon first visit to our website?
What attributes are set on initial creation of cookie? Is this just the UUID?
Is cookie subsequently written to? And when? And what call does that? We then see all of our device-based destination partners showing up as attributes of the cookie.

Any insight would be greatly appreciated.

Rachit_sachdev_01 · Accepted Answer

Hi Marc,

Audience Manager sets the Demdex cookie to assign a unique ID to a site visitor.

This is set on the first visit on any website which has an Adobe Visitor Id service implemented on their website. So it could be your website or any other. The demdex cookie is set in the third-party, demdex.net domain, which is separate from the website domain.

The demdex cookie contains a Unique User ID (UUID) as shown in the example below:

06151304227769720433039235178204449977

Lifetime: The demdex cookie has a time-to-live (TTL) interval of 180-days. The TTL is reset to 180-days upon each user interaction with a partner website. The cookie expires if a user does not come back to your site within the TTL interval.
Opt-out: Audience Manager resets the cookie with a Do Not Adobe Target string if a user opts-out of data collection. In this case, the cookie TTL is set as 10 years.

To understand the working of calls to Visitor Id service and setting of cookies check the Product document:

Best,

Rachit

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