fastclick.net
fastclick.net is an advertising domain that turns up in the request chain on pages selling display space. If you have seen it in a content blocker's log or a browser network tab and wondered what it is doing there, this page is what the crawl can say about it. The index attaches no vendor name, company or category to the domain — it was recorded as a hostname, not identified as a product. It was detected on 60 of the 5,294 sites measured, 1.1 percent, ranking 70th of the 88 companies here by reach.
Nearly every site carrying it also carries a banner
57 of the 60 sites showed a recognisable consent tool. That is the striking figure in this file: 95 percent of the sites carrying the domain also carried a banner. The IAB TCF signal was seen on 42 of them and OneTrust on 13, with Usercentrics and Cookiebot on 1 each — sighting counts rather than slices, since a site can run more than one layer. The TCF signal is the industry framework that ad-funded publishers implement so a consent state can be passed down the advertising chain, and finding it on 42 of 60 sites describes the kind of page involved more efficiently than any other number here.
Small reach, top-ten weight
70th of 88 on how many sites carry it, and then: 8th of 88 on median companies contacted, at 18. 9th of 88 on median third-party requests, at 85. 15th of 88 on median trackers, at 4. 4th of 88 on median companies contacted before the window closed, at 12, level with three others. The domain is uncommon across the corpus and the pages where it does appear are among the heavier ones measured. Reach and weight are separate axes and this entry sits at opposite ends of the two.
Audience and identifier services cluster around it
Google was on 48 of the 60 sites, 80 percent, and Amazon Ads on 47, 78.3 percent — the two almost level. Below them the list turns specialised: crwdcntrl.net on 36, 60 percent; id5-sync.com on 34, 56.7; Comscore on 30, 50; ad-delivery.net on 22, 36.7; btloader.com and dns-finder.com on 21 each, 35; Amazon on 13, 21.7; hadronid.net on 11, 18.3. Two of the top five are audience and identifier services and each appears on more than half the set. Whatever fastclick.net does itself, the pages around it are running audience matching.
Four more companies after the window
57 of the 60 sites, 95 percent, had a company contacted before the banner window closed, which ranks 34th of 88. Median first contact was 654 milliseconds, 48th of 88, and the quickest recorded was 109 milliseconds. At the median, 4 further companies are contacted after the window has closed — measured directly, not derived from the other two medians, which would give a different and wrong answer. This is not a set where the third-party work is finished in the first second and then stops.
News sites, and one site about cookies
The examples are almost all publishers: time.com registered 26 companies with 22 of them inside the window; trilltrill.jp 31 with 19; indiatimes.com 30 with 20; corriere.it 23 with 11; newsweek.com 22 with 19; lanacion.com.ar 20, all inside; soundcloud.com 15 with 11; buzzfeed.com 15, all inside; sport.es 14 with 12; mashable.com 13, all inside; footmercato.net 8, all inside and the lightest of the twelve. The twelfth is allaboutcookies.org, a consumer explainer site about cookies and tracking. It registered 11 companies, 7 of them inside the window, running OneTrust, with first contact at 915 milliseconds.
| Site | Companies | Before consent | First contact |
|---|---|---|---|
| soundcloud.com | 15 | 11 | 228 ms |
| indiatimes.com | 30 | 20 | 969 ms |
| time.com | 26 | 22 | 157 ms |
| allaboutcookies.org | 11 | 7 | 915 ms |
| corriere.it | 23 | 11 | 986 ms |
| lanacion.com.ar | 20 | 20 | 396 ms |
| buzzfeed.com | 15 | 15 | 422 ms |
| newsweek.com | 22 | 19 | 777 ms |
| trilltrill.jp | 31 | 19 | 968 ms |
| sport.es | 14 | 12 | 749 ms |
| mashable.com | 13 | 13 | 293 ms |
| footmercato.net | 8 | 8 | 285 ms |
| Tool | Sites |
|---|---|
| IAB TCF consent tool | 42 |
| OneTrust | 13 |
| Usercentrics | 1 |
| Cookiebot | 1 |
Seen on the same pages
Companies most often contacted by the same sites. Co-presence only — the crawl records what arrived, not who called whom.
- GoogleTogether on 48 of these sites
- Amazon AdsTogether on 47 of these sites
- crwdcntrl.netTogether on 36 of these sites
- id5-sync.comTogether on 34 of these sites
- ComscoreTogether on 30 of these sites
- ad-delivery.netTogether on 22 of these sites
- btloader.comTogether on 21 of these sites
- dns-finder.comTogether on 21 of these sites
Questions
What is fastclick.net?
An advertising domain observed in the request chains of ad-supported pages. This index deliberately does not attach a vendor or a category to it: the crawler recorded the hostname it saw, and everything on this page describes the sites it appeared on rather than the business behind it.
Why do so many of its sites show a consent banner?
57 of 60, with the IAB TCF signal on 42 of them. The most direct reading is that ad-funded publishers implement that framework because the advertising chain expects a consent signal to be passed along it, so the banner and the ad stack tend to arrive together.
Is fastclick.net a major presence on the web?
By reach, no: 60 sites out of 5,294, which ranks 70th of the 88 companies here. The weight is in the pages rather than the spread — those 60 sites rank 8th of 88 on median companies contacted and 9th of 88 on median requests.
What does a median of 4 companies after the window mean?
Across the 60 sites, the median count of companies first contacted after the consent window had closed is 4. Half added that many or more at that stage, which places these pages in the group that keeps opening new connections well into the load.