Xandr (Microsoft)
AdvertisingXandr (Microsoft) loaded on 104 sites in our October 2026 scan: 4% of the 2,450 most-visited sites we checked, before any visitor had given consent.
Category: Advertising. A company can do several jobs; this is its main role on the pages we saw.
Its cookies typically last about 3 months. On 66% of the sites where it loaded, a consent banner was already present but hadn't been answered yet. It's especially common on .com.br sites: 30% of them load it, versus 4% of all sites we scanned.
About Xandr (Microsoft)
Xandr, formerly AppNexus, is a programmatic ad exchange that Microsoft acquired from AT&T in 2022 and now runs as part of Microsoft Advertising.
Its adnxs.com domains run real-time bidding auctions between advertisers and publishers, setting an identifier such as the anj or uuid2 cookie so a bidder can recognize the same browser across multiple auctions.
Xandr participates in the Network Advertising Initiative's opt-out program.
Often loaded alongside
Sites that load Xandr (Microsoft) most often also load Google Ads (91%), Google (88%), Google Analytics (85%), Magnite (49%), and PubMatic (49%).
Domains it loads from
- ib.adnxs.com
- secure.adnxs.com
- acdn.adnxs.com
- ib.adnxs-simple.com
Cookies
- uuid216 sites
- XANDR_PANID16 sites
- anj14 sites
Sites that load Xandr (Microsoft)
The highest-ranked 30 of 104 sites.
- amazon.com33 tracking companies
- autodesk.com6 tracking companies
- alibaba.com7 tracking companies
- dell.com12 tracking companies
- globo.com24 tracking companies
- amazon.co.za32 tracking companies
- trendmicro.com8 tracking companies
- uol.com.br17 tracking companies
- techcrunch.com38 tracking companies
- elpais.com7 tracking companies
Show 20 more sites
- box.com8 tracking companies
- usps.com24 tracking companies
- nbcnews.com20 tracking companies
- qualtrics.com7 tracking companies
- fidelity.com15 tracking companies
- amazon.com.mx34 tracking companies
- olx.com.br10 tracking companies
- terra.com.br23 tracking companies
- as.com7 tracking companies
- aftonbladet.se1 tracking company
- lanacion.com.ar14 tracking companies
- clarin.com13 tracking companies
- dmm.co.jp5 tracking companies
- vnexpress.net14 tracking companies
- vg.no1 tracking company
- netkeiba.com20 tracking companies
- jalan.net27 tracking companies
- tenki.jp27 tracking companies
- oricon.co.jp36 tracking companies
- haberler.com14 tracking companies
Understanding this page
- What the tracker categories mean
What "advertising," "analytics," "social," "consent" and the rest actually mean for a company or a cookie, and how CookieTosser decides which one applies.
- First-party vs third-party cookies (and why "first-party" still tracks you)
What the distinction actually means technically, why browsers only block one of the two, and how CNAME cloaking, server-side tagging and cookies like _ga let sites keep tracking under their own domain.
- How to block or limit trackers
Browser privacy settings, content blockers, Global Privacy Control and clearing cookies compared honestly — what each one actually stops, what it doesn't, and what it costs you in return.