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What is AdsTxtCrawler?

Direct Answer: AdsTxtCrawler by OneTag Limited crawls ads.txt files to verify onetag.com line presence.

Operator: OneTag Limited Type: Advertising Bot Purpose: Verify ads.txt file contents for onetag.com line presence

The AdsTxtCrawler is operated by OneTag Limited for the purpose of crawling ads.txt files from publishers. This is done to verify the presence of the onetag.com line. The bot's behavior is specifically designed for this task.

User-Agent Identification

The following user-agent strings identify AdsTxtCrawler in your live traffic data:

  • AdsTxtCrawler/1.0; +https://github.com/InteractiveAdvertisingBureau/adstxtcrawler

robots.txt Rules for AdsTxtCrawler

Respects robots.txt: No

This bot does not commit to following robots.txt

AdsTxtCrawler does not officially follow robots.txt directives. The only reliable way to control access is through server-side blocking (IP filtering, user-agent rules in your web server config) combined with log monitoring to verify effectiveness.

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Crawl Behavior

Frequency:Not Documented

Request Pattern:Not Documented

Official Documentation Quotes

"OneTag is required to crawl ads.txt files from our publishers to verify the presence of the onetag.com line"

Crawl Activity Index

Relative crawl activity for AdsTxtCrawler over the past 28 days. Higher values indicate increased crawling intensity compared to the period baseline.

View recent activity data (last 7 days)
Date Activity Index
Mar 28, 2026 35.1
Mar 29, 2026 33.6
Mar 30, 2026 32.2
Mar 31, 2026 36.3
Apr 1, 2026 35.4
Apr 2, 2026 32.4
Apr 3, 2026 38.6

Source: Cloudflare Radar

Why track AdsTxtCrawler traffic?

Verify ad system crawling behavior. AdsTxtCrawler evaluates your pages for ad targeting, quality scoring, and policy compliance.

Optimize ad delivery. If AdsTxtCrawler can't properly access certain pages, ad targeting and revenue may be impacted. Log monitoring confirms accessibility.

Log Verification

To verify AdsTxtCrawler traffic in your live traffic data:

  1. Search access logs for the user-agent strings listed above
  2. Check if the IP addresses match documented ranges (if provided by OneTag Limited)
  3. Verify the crawl pattern matches documented behavior
  4. Use reverse DNS lookup for additional verification if available

Note: Observed behavior in production environments may differ from official documentation. Live traffic monitoring provides the only reliable verification of actual bot behavior.

Undocumented Information

The following information is not officially documented for AdsTxtCrawler:

  • crawl frequency
  • request pattern
  • IP verification method
  • JavaScript rendering details

Official Documentation

View Official AdsTxtCrawler Documentation →

Information sourced from official documentation. Content generated with AI assistance.