What Is Bingbot In SEO

Bingbot is Microsoft’s web crawler, the spider that discovers, fetches, and indexes pages for the Bing search engine. It identifies itself with the user agent string Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) and runs on a fetch, parse, and store pipeline much like other major crawlers. When it visits a server, it is doing the same job Googlebot does for Google: walking links, downloading HTML, and feeding what it finds into the Bing index.

Many site owners treat Bing as a secondary concern. That framing misses two things. Bingbot’s crawl decisions also feed Yahoo Search and AOL, and serve as a primary upstream source for DuckDuckGo and Ecosia, so blocking the bot can quietly remove pages from a non-trivial slice of the search market. Bingbot’s crawl budget rules, robots.txt behavior, and throttling controls are not identical to Googlebot’s, and getting the configuration wrong can hide pages you did not intend to hide.

How Bingbot Actually Crawls the Web

Bingbot starts from a known set of seed URLs and follows links outward, fetching pages over HTTP/1.1 and HTTP/2, parsing the response, and pushing what it finds into the Bing index. A separate set of mobile user agents, the smartphone variants, handle mobile rendering for pages served to phones. Same bot, same pipeline, different declared device class.

Every request the bot makes carries the user agent string Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm), and that URL is a working verification path, not a vanity link. It points to a Bing page that documents how to confirm a request is real: copy the connecting IP from your server log, run a reverse DNS lookup, and confirm the result ends in .search.msn.com. Then run a forward DNS lookup on that hostname and confirm the same IP comes back. If either step fails, the request is not genuine Bingbot. That two-step check is the only reliable way to tell real Bing traffic from a scraper copying the user agent string. Bingbot also honors the standard crawler directives: robots.txt Disallow and Allow rules, meta robots tags, and the x-robots-tag HTTP header for non-HTML resources like PDFs and images.

Why Bingbot Powers More Than Just Bing

Bing’s index does not stop at bing.com. It feeds Yahoo Search and AOL Search directly, and is one of the primary upstream sources for DuckDuckGo and Ecosia, so a page Bingbot cannot crawl cannot be ranked on any of those surfaces either. That is the part site owners tend to underestimate. The crawler you decide to block is the one deciding whether a product page shows up in a Yahoo SERP or a DuckDuckGo answer, not just on Bing.

On raw market share, Bing has hovered in the high single digits of global desktop search in Statcounter readings from 2024 and 2025, roughly 6 to 8 percent, with US desktop share running a few points higher than the global average and mobile share lower. The partner engines push the real reach higher. A robots.txt mistake that quietly removes a section of the site from Bing’s crawl queue costs impressions across the whole downstream network, not just one search box – exactly the kind of oversight Clickside catches in a technical SEO audit.

Controlling Bingbot on Your Site

Robots.txt Rules Bingbot Understands

Bingbot reads standard User-agent: bingbot blocks with Allow and Disallow patterns, so you can carve out staging, internal search, or infinite facet URLs without affecting other engines. Patterns are evaluated the way other major crawlers evaluate them: longest match wins, and a more specific Allow rule overrides a broader Disallow. The most useful application is pulling low-value URL patterns out of the crawl queue and protecting crawl budget for the pages you actually want indexed.

Crawl Rate Limits in Bing Webmaster Tools

Bingbot’s crawl rate can be set in 0.1 increments, from 0.1 to 10 requests per second, with separate peak and off-peak time windows in the Settings panel. Two practical starting points:

• Drop the rate to 0.1–0.5 requests per second when servers are strained or during a deploy.
• Raise the rate toward 10 for large, healthy sites that want faster recrawling and fresher indexing.

The Crawl-Delay Directive Bingbot Respects

Unlike Googlebot, Bingbot honors the Crawl-delay: directive in robots.txt, which gives you a server-side way to throttle the bot without opening Bing Webmaster Tools at all.

Verifying Real Bingbot and Common Pitfalls

The verification routine is short. Take an IP from your server log, run a reverse DNS lookup, and confirm the hostname ends in .search.msn.com. Then run a forward DNS lookup on that hostname and confirm the same IP comes back. Both directions have to match, otherwise it is a fake. User agent strings alone are not enough, since they are trivially spoofed, and a log filter that only checks them will let scrapers walk right through.

Three mistakes come up over and over. First, blocking the bingbot user agent to “stop scrapers” also stops real Bing indexing, which removes the site from Yahoo, AOL, DuckDuckGo, and Ecosia along with it. Second, setting Crawl-delay to 30 seconds across a large site can leave new pages uncrawled for days, since Bingbot’s crawl budget shrinks sharply under that kind of throttle. Third, relying on user agent strings in log filters instead of the DNS check, which is how spammers get logged as “bingbot” in analytics and quietly skew the data. A DNS-verified log audit is the clean fix, and the Clickside team runs them as part of a standard technical SEO workup.

Optimizing for Bingbot Without Losing Focus on Google

Bingbot is a real, mechanism-driven crawler whose reach extends across multiple search engines, and it has at least one behavior, Crawl-delay, that Googlebot does not share. The day-to-day SEO basics cover most of it: clean robots.txt, fast pages, valid schema, mobile rendering. The actual work is mostly in not blocking the bot by accident.

One clear next step. Claim and verify the site in Bing Webmaster Tools, then run the reverse and forward DNS check on the next ten Bingbot hits in your server log to confirm they are real.