Websites using AppNexus 
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Here is 25 of 7,728 websites using AppNexus.
You can filter as you like (only .co.uk tld with 2.x version for example).
You'll find alexa rank, tool version, TLD, lang, emails and the main contact url.
Buy the report to download the CSV/XLS file
| Alexa | Domain | Version | Contact | |
|---|---|---|---|---|
| Alexa | Domain | Version | Contact |
Google AdSense
DoubleClick Ad Exchange (AdX)
Fusion Ads
Criteo
AdRoll