Privacy LitigationWeb Tracking
What Is Google's Advanced Consent Mode? Is It Defensible Under CIPA?
Advanced Consent Mode lets Google tags run before a visitor makes a choice, sending Google a "cookieless ping" instead of the full data. That ping preserves conversion modeling, but may leave businesses vulnerable to pen register wiretapping claims.
Summary
Google offers two ways to run its tags under a consent banner. "Basic mode" holds the tags until the visitor consents. "Advanced mode" loads them immediately and sends Google a cookieless ping while consent is denied. Advanced mode sets no cookies while consent is denied, but the ping is still a request from the visitor's browser to Google, and it carries the visitor's IP address. Under CIPA Section 638.51, that request could be interpreted as a pen register installed without consent. Advanced mode trades the most defensible privacy position for better marketing data.
What Is Consent Mode, and How Do Its Two Modes Differ?
Consent Mode is how Google's tags learn what types of web tracking the visitor has agreed to. The tags receive consent signals, such as whether analytics and advertising storage are granted or denied, and adjust their behavior. Consent Mode has two implementations, and Google's documentation describes both.
The main difference is tag-firing timing. In Basic mode, Google tags do not load until consent is granted. In Advanced mode, the tags load immediately, and if consent is denied (either by default or by explicit preference) they send cookieless pings that Google uses to model the conversions it can no longer directly observe.
| Behavior | Basic mode | Advanced mode |
|---|---|---|
| Tag loading | Once consent is granted, by regional default or by choice | On every page load, regardless of consent denials |
| Data sent before consent | Nothing until consent is granted, by default or by choice | Cookieless pings with consent state, page URL, and headers |
| Cookies before consent | None. No Google cookies are read or written without consent | None. No Google cookies are read or written without consent |
| Conversion modeling | General model, less detailed, built without your site's pings | Advertiser-specific model, plus behavioral modeling in Analytics |
| What a plaintiff sees | An empty network log until consent, by default or by choice | Network requests on every page load, regardless of consent |
Behavior per Google's Consent Mode documentation, as of September 2026.
The Pen Register Problem
CIPA wiretapping letters sometimes lean on Section 631(a), the interception provision, which requires reading or learning the contents of a communication to support a claim. Advanced mode holds up well there. A cookieless ping carries no form input, no search terms, and no identifier tied to a person.
However, some CIPA claims lean on Section 638.51, the pen register provision, which focuses on routing and addressing information rather than contents. The theory is that a script capturing a visitor's IP address and device details is a pen register installed without consent.
The pen register theory fits Advanced mode closely. The ping is a request to Google carrying the visitor's IP address and user agent, and it is sent before the visitor has agreed to anything. Courts have split on whether ordinary web requests can be pen registers at all, but some have allowed the theory to proceed. Plaintiffs rely on that case law, often attaching a network log showing a request to Google on first load, with consent denied and the tracking running in Advanced mode.
What Does Google Say About IP Addresses?
For what it's worth, Google says that it does not keep the IP address. Google Analytics documentation states that in Google Analytics 4, IP addresses are not logged or stored. For the advertising tags, Google's consent mode documentation says that when advertising storage is denied, IP addresses are used to derive a country, are never logged by its Google Ads and Floodlight systems, and are deleted immediately upon collection.
Regardless, these facts are not highly relevant at the demand letter stage. A pen register claim is about the capture of routing information, and the capture happens when the request leaves the browser. What Google does after it arrives is unverifiable to the plaintiff. Google's internal handling of IP addresses is an incomplete and imperfect defense to rely upon.
What to Consider
The use of Advanced Consent Mode should be a business decision. It cannot be made without understanding the business value of the modeling Advanced mode enables and the perceived risk of litigation.
- The value of the modeling. If campaigns depend on modeled conversions, Basic mode has a clear downside. If you do not get business value from the modeled numbers, Advanced mode adds risk without benefit.
- Where the visitors are. California traffic drives CIPA exposure. Other states with all-party-consent wiretap statutes and statutory damages add to it.
- Whether the privacy notice describes the pings. Advanced mode is more defensible when the notice states that Google tags load before consent and what they send when consent is not granted.
- Whether the site works correctly in either mode today. Many sites I review set Google cookies during unconsented states, which is not how either mode is meant to work.
Basic mode, enforced at the script level, is the most defensible position. Advanced mode is a legitimate choice when the modeling is worth it, the notice is accurate, and the business accepts the litigation risk.
Questions
What is in a cookieless ping?+
Google's documentation lists a timestamp, the user agent, the referrer, the full page URL including any ad-click parameters, a yes-or-no consent state, a random number generated on each page load, and information about the consent platform in use. Google does not list the IP address as ping content, but every web request carries one, and Google's own consent mode page says that with advertising storage denied, the IP address is used to derive a country and then deleted. No cookies are read or written.
What is conversion modeling, and how do the two modes differ?+
A conversion is an action the business wants a visitor to take, such as a purchase, a sign-up, or a form submission, that Google ties back to the ad or search that brought the visitor. When a visitor declines consent, Google cannot see whether that visitor later converted. Conversion modeling is Google's estimate of those unseen conversions, so that campaign reports and bidding still account for them.
Basic mode gets a general model built without your site's own signals. Advanced mode gets a model built from your site's cookieless pings, which Google describes as more detailed, and in Google Analytics 4 it also unlocks behavioral modeling of declined visitors. That modeling has volume thresholds, so a smaller site may run Advanced mode and never qualify for it.
Can a site use Advanced mode and still be defensible under CIPA?+
Yes, with conditions. The privacy notice should say that Google tags load before consent and what they send when consent is denied. The site has to work the way the mode is meant to, with no Google cookies set while consent is denied. Otherwise, the mode does not matter.
The business also has to accept the risk that a demand letter may arrive with a screenshot of the cookieless ping, alleging a pen register violation.
Briefings are informational and do not constitute legal advice.
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