What is AdsTxtCrawler?
AdsTxtCrawler is a bot operated by OneTag that crawls and retrieves ads.txt files from websites. These files are part of an Interactive Advertising Bureau standard that publishers use to publicly declare which companies are authorized to sell their advertising inventory in programmatic advertising. You can set up Agent Analytics to see when AdsTxtCrawler visits your website.
Category
| Example User Agent | AdsTxtCrawler/1.0 |
| Operated By | OneTag |
| Source | Official Website |
| Triggered By | Operator-configured crawl |
| Used for AI Model Training | Possibly |
| Affects AI Chat & Search Visibility | Not directly |
| Expected To Follow Robots.txt | Yes |
Why Is AdsTxtCrawler Visiting My Website?
Your site contains data AdsTxtCrawler's operator wants, such as prices, listings, contact details, or articles. Repeated visits generally indicate that your content remains a collection target.
Should I Block AdsTxtCrawler?
Often. AdsTxtCrawler collects content at scale, and scrapers in this category may republish or resell it. The site being scraped rarely benefits, while duplicate copies can compete with its pages in search results. For context, 7% of the top websites we track currently have robots.txt rules for AdsTxtCrawler.
How Do I Block AdsTxtCrawler Using Robots.txt?
Add this rule to your robots.txt file to block AdsTxtCrawler from accessing your website, or use Automatic Robots.txt to block all scrapers at once. You can customize which pages are blocked by swapping out / for a different path.
User-agent: AdsTxtCrawler # https://knownagents.com/agents/adstxtcrawler
Disallow: /Insights for AdsTxtCrawler
As of October 29, 2026, this data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the top 1000 websites and their robots.txt files.
Robots.txt Compliance
Country of Origin
Robots.txt Blocked Percentage
AdsTxtCrawler Traffic
Frequently Asked Questions
What Traffic Patterns Should I Expect From AdsTxtCrawler?
AdsTxtCrawler behaves according to its operator's configuration, and scrapers are among the least predictable bots on the web. It may range from slow, careful extraction to rapid, aggressive fetching, ignore robots.txt, or change its user-agent string when blocked. Its request volume and speed are more informative than its label.
Does AdsTxtCrawler Follow Robots.txt Rules?
AdsTxtCrawler is expected to follow robots.txt rules, so a disallow rule is the appropriate first step if you want to block it. Automatic Robots.txt can add and maintain that rule, while Agent Analytics lets you verify whether AdsTxtCrawler respects it.
Is AdsTxtCrawler Used for AI Model Training?
Possibly, but its category does not establish that purpose. AdsTxtCrawler's operator may use or provide the collected content for AI training or for unrelated automated tasks.
Does Blocking AdsTxtCrawler Affect AI Search or Citations?
Not directly. AdsTxtCrawler's expected purpose is not to supply an AI search index or retrieve pages for AI-generated answers.
Does AdsTxtCrawler Access Private Content?
It may try. Scrapers often ignore robots.txt, and some attempt to collect valuable paywalled or gated content. Authentication is the strongest protection; robots.txt alone does not restrict access.
How Can I Verify a Request From AdsTxtCrawler?
Agent Analytics tracks AdsTxtCrawler visits in real time. You can also check your server logs for requests whose user-agent string contains "AdsTxtCrawler". Look for rapid, sequential requests across many pages. Because AdsTxtCrawler does not publish a verification method, any client can claim its identity and a log match is only a clue.
How Is AdsTxtCrawler Different From Other OneTag Agents?
OneTag operates separate agents for different purposes, so each agent should be evaluated and controlled independently.
- InteractiveAdvertisingBureau: InteractiveAdvertisingBureau crawler by OneTag verifies ads.txt files from publishers to confirm authorized reseller relationships and ad placement authentication for pro…