Microsoft
Bingbot
Microsoft's primary web crawler for Bing Search. Also provides content for Bing Chat (Microsoft Copilot).
Purpose: Search indexing and AI answer generation
📊 Popularity & Traffic
#2Ranking among AI crawlers
~8-10% of search+AI crawler trafficTraffic share
Second-largest search crawler. Slight decline in share but still grew ~2% in absolute volume.
🤖 User Agent Strings
Use these patterns to identify Bingbot in your server logs or configure your robots.txt file.
Bingbot
Respects robots.txtPrimary Bing crawler for search and AI
Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)BingPreview
Respects robots.txtGenerates page previews for Bing Chat and other features
Mozilla/5.0 (Windows NT 10.0; ...; bingpreview/1.0b)🌐 IP Ranges
Source: Official Microsoft JSON file
Official source fileIdentified IP Ranges6 Ranges
157.55.0.0/16Subnet with 65536 addresses
157.56.0.0/16Subnet with 65536 addresses
13.64.0.0/11Subnet with 2097152 addresses
40.74.0.0/15Subnet with 131072 addresses
52.145.0.0/16Subnet with 65536 addresses
20.80.0.0/12Subnet with 1048576 addresses
How to read CIDR notation:
The/28 suffix indicates a block of 16 IP addresses. For example,.112/28 covers all addresses from .112 up to .127. Adding these to your firewall will block the entire range used by Bingbot.📝 Robots.txt Configuration
Add the following to your robots.txt file to block Bingbot:
User-agent: Bingbot
Disallow: /
# Or just block previews:
User-agent: BingPreview
Disallow: /💡 Important Notes
- No separate 'CopilotBot' - Bing Chat uses content from Bingbot's index
- Use NOARCHIVE meta tag to exclude from Bing Chat without blocking search
- Use NOCACHE meta tag to limit Bing Chat usage while allowing snippets
- Blocking Bingbot removes you from both Bing Search AND Bing Chat
Beyond blocking crawlers
See what AI is saying about your brand
Understanding crawlers is step one. With Aiso, you can see the actual conversations happening about your brand inside ChatGPT, Claude, and Perplexity.