btloader.com: an uncatalogued host on very busy pages

It arrives with the same two hostnames nearly every time

ad-delivery.net was present on 87 of the 89 sites — 97.8% — and dns-finder.com on 79, or 88.8%. Only after those two does the list start to look like advertising in general: Google on 64 sites (71.9%), Amazon Ads on 41 (46.1%), Comscore on 28 (31.5%), crwdcntrl.net and fastclick.net on 21 each (23.6%), jsDelivr on 17 (19.1%), Cloudflare Analytics and confiant-integrations.net on 14 each (15.7%).

Most entities in this index have a co-presence list that opens with Google, because Google is on a great many pages. This one opens with two hostnames almost nobody could name, at rates that suggest they are delivered as a unit rather than chosen separately. The crawl records that they were on the same pages. It does not establish who operates any of them, and this page will not fill that gap with a guess.

Twelve companies before anything could be answered

The median site here contacted 12 companies inside the pre-consent window, which ranks 4th of the 88 companies in this index — three entities sit on pages with a higher median and three more report the same 12. The same median page contacted 18 companies in total, seventh of 88, over 85 requests, eighth of 88.

Early contact was recorded on 81 of the 89 sites, 91%. As everywhere in this corpus, that is counted per site and not by name: the measurement knows how many companies arrived in the window, never which ones, so nothing here places btloader.com among them on any particular page.

94% of these sites did show a banner

Consent software was detected on 84 of the 89 sites. The IAB TCF framework was seen alongside on 62 of them, OneTrust on 17, Cookiebot on 4 and Usercentrics on 1; sites can carry more than one banner, so these are sightings rather than portions of the 84.

That number closes off the usual explanation. Across this index the common reason a page has early contact is that it never asked anything at all. Here almost every site asked. These publishers built a consent interface, most of them using the advertising industry's own framework, and the median page still reached twelve companies before that interface could have been answered.

Three trackers, eighteen companies

Only 3 companies on the median page were classified as tracking, which ranks 23rd of 88 and sits oddly beside the 18 companies contacted.

The explanation is in the catalogue rather than the page. Classification requires a vendor entry, most of the hostnames on these pages do not have one — btloader.com included — and an uncatalogued domain cannot be classified as anything. On pages assembled out of unfamiliar advertising hosts, the tracker count understates by construction. Where the two numbers disagree this far, the count of companies is the one describing the page.

Fast, and on sites you have heard of

Median first contact was 530 ms, ranking 78th of 88 on a scale where rank 1 is the slowest median; the quickest recorded in the group was 85 ms.

time.com contacted 26 companies with 22 of them inside the window, first contact at 157 ms, behind an IAB TCF banner. imgur.com: 14 and 14, at 216 ms. theverge.com: 21 and 21, at 271 ms behind OneTrust. letterboxd.com: 10 and 10. lanacion.com.ar: 20 and 20. ynet.co.il: 27 with 20. msn.com, the highest-ranked site in the sample, contacted 12 with 11 inside the window at 417 ms. Then nexusmods.com at 17 with 12 behind a Cookiebot banner, gsmarena.com at 11 with 9, gamewith.jp at 14 with 13, and otomoto.pl at 12 with 8. olx.pl is the slow one: 14 companies, 6 inside the window, first contact at 1,152 ms.

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.

• ad-delivery.netTogether on 87 of these sites
• dns-finder.comTogether on 79 of these sites
• GoogleTogether on 64 of these sites
• Amazon AdsTogether on 41 of these sites
• ComscoreTogether on 28 of these sites
• crwdcntrl.netTogether on 21 of these sites
• fastclick.netTogether on 21 of these sites
• jsDelivrTogether on 17 of these sites