Bingbot fetches pages for Microsoft’s Bing search engine. In its overview of Bing crawlers, Microsoft calls it the standard crawler. Bing keeps its rendering engine updated to the latest stable version of Microsoft Edge, and that version number appears in the user agent. One of the forms:
Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)Bing’s other crawlers
The same page lists, among others, AdIdxBot (for ads in Bing), BingPreview (page screenshots for Bing) and MicrosoftPreview (screenshots for Microsoft products).
How do you check it?
Microsoft warns that user agents are easy to imitate. With the Verify Bingbot tool in Bing Webmaster Tools, you can check whether an IP address really belongs to Bing. You control how Bingbot visits your site with robots.txt and with the Crawl control feature in Bing Webmaster Tools, where you set the crawl rate per hour.
Common mistake
Only paying attention to Googlebot. If a firewall or bot protection blocks Bingbot, you miss out on Bing. Check in your server logs that Bingbot fetches your pages with a normal status code.
More in the Technical SEO checklist.