User Agent Database List - Explore Web Browsers and Crawler String Lists
Access the definitive, updated database of official web crawler user-agent strings including Googlebot, Bingbot, YandexBot, and Applebot. Master crawler identification, reverse DNS validation, and robots.txt crawler rules for optimal site crawlability.
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How to use Search Engine Bots Directory Online
Step 1: Navigate the curated database of top search engines, utility checkers, and platform scrapers.
Step 2: Click and read the exact, fully verified, production-compliant User-Agent strings.
Step 3: Copy raw tokens to craft granular security firewall policies or targeted crawler directives.
Frequently Asked Questions
What is a User-Agent string in technical SEO?
A User-Agent string is a unique request header sent by web clients (like browsers and search crawlers) to identify their operating system, software engine, and version to web hosts.
How can I selectively allow Googlebot while blocking scrapers?
Use the 'User-agent: Googlebot' directive in your robots.txt file to apply crawl permissions, and configure server firewalls to run reverse DNS lookups that confirm bot authenticity.
What happens if my server blocks official search crawler User-Agents?
Blocking official web crawlers will prevent your content from being scanned, leading to rapid de-indexing and a total loss of organic visibility in search results.