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What is

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ads.txt? 

Ads.txt (also known as Authorized Digital Sellers) is an IAB initiative aimed to help prevent unauthorized inventory sales. Publishers drop a text file on their web servers that lists all of the resellers that are authorized to sell the publishers’ inventory. Similarly, programmatic platforms also integrate ads.txt files to confirm which publishers’ inventory they are authorized to sell. This allows buyers to check the validity of the inventory they purchase.

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Very easy. It is as simple as posting a text file to a publisher's domain similar to what virtually every website already does today with their robots.txt file. Additionally, we recently released a free Ads.txt validation tool to the public. This free resource will help digital publishers ensure their ads.txt files are free of errors.

What percent of pubs (especially top 200 pubs) have implemented ads.txt already? Where

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can I get an up-to-date list? 

Adoption is rising quickly, with 77 percent of the top 1,000 domains on AppNexus having adopted ads.txt already. This figure is likely to increase in 2018. Because ads.txt has been developed and publicized by the IAB, AppNexus expects and encourages all publishers and exchanges to adopt this standard, as it is in publishers' best interests to do so.

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No, not really, but ads.txt use is strongly encouraged. Publishers are free to decide when and if they post an ads.txt file and those that have posted them reflect a wide range of web content. 

When is

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ads.txt being being enforced by AppNexus?

Starting Jan 24, for those publishers that have ads.txt implemented, AppNexus will only buy from authorized monetization partners. 

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