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" \n\nads.txt (Authorized Digital Sellers) is an initiative from IAB<\/a> Technology Laboratory. It specifies a
text file<\/a> \n\n\n\nA text file (sometimes spelled textfile; an old alternative name is flatfile) is a kind of computer file that is structured as a sequence of lines of electronic text. A text file exists stored as data within a computer file system. In operat ...
<\/span><\/div> that companies can host on their
web server<\/a>s, listing the other companies authorized to sell their products or services. This is designed to allow online buyers to check the validity of the sellers from whom they buy, for the purposes of
internet fraud prevention<\/a> \nInternet fraud prevention is the act of stopping various types of internet fraud. Due to the many different ways of committing fraud over the Internet, such as stolen credit cards, identity theft, phishing, and chargebacks, users of the Internet, ...
<\/span><\/div>.\n


State of adoption<\/h1><\/p>\nBy November 2017, more than 44% of publishers had ads.txt<\/code> files.<\/ref> More than 90,000 sites were using ads.txt<\/code>, up from 3,500 in September 2017, according to Pixalate. Among the top 1,000 sites that sold programmatic ads, 57 percent had ads.txt<\/code> files, compared to 16 percent in September, per Pixalate.<\/ref>\n\nLatest adoption data per FirstImpression.io's Ads.txt Industry Dashboard:\n\n\n

Google<\/a> \n\n\n\n\n\n\n\nGoogle LLC () is an American Multinational corporation, multinational technology company focusing on Search Engine, search engine technology, online advertising, cloud computing, software, computer software, quantum computing, e-commerce, ar ...
<\/span><\/div> has been an active proponent of ads.txt<\/code> and pushing for faster, widespread adoption by publishers. From the end of October 2017 Google Display & Video 360 only buys inventory from sources identified as authorized sellers in a publisher\u2019s ads.txt<\/code> file, when a file is available. ads.txt<\/code> may become a requirement for Display & Video 360.<\/ref>\n


File format<\/h1><\/p>\nThe IAB's ads.txt specification<\/ref> dictates the formatting of ads.txt files, which can contain three types of record; data records, variables and comments. An ads.txt file can include any number of records, each placed on their own line.\n\nSince the ads.txt file format must be adhered to, a range of validation,<\/ref> management and collaboration tools have become available to help ensure ads.txt files are created correctly.\n\nLatest specification v1.0.2IABTechLab ads.txt Specification v1.0.2<\/a>
\/ref> recommends using a placeholder record to indicate the intent of an empty ads.txt file:\n\n


See also <\/h1><\/p>\n*