Glossary · IndexNow

IndexNow

An open protocol, supported by Bing, Yandex and others, that lets a website notify search engines instantly when content changes — eliminating the wait for a crawl.

Full Definition

IndexNow is a simple HTTP-based protocol launched by Microsoft and Yandex in 2021 that lets publishers ping participating search engines the moment a URL is created or updated. The publisher hosts a key file at the root of their domain, then POSTs URLs to a single IndexNow endpoint; the engines re-crawl those URLs typically within minutes. IndexNow is not yet adopted by Google, but it is by Bing — which means content shows up in Bing search, Microsoft Copilot, Yahoo, DuckDuckGo Instant Answers, and other Bing-fed surfaces almost immediately. For high-stakes new content (a press release, a crisis statement, a corrected biography) this can be the difference between hours of stale results and instant updates. Implementation is trivial: a key file in /public, an authenticated endpoint that submits URLs, and (ideally) a deploy hook that calls the endpoint on every release.

In practice

  • A company corrects an inaccurate biography page and pings IndexNow; Bing's crawler updates the result within 15 minutes, and Microsoft Copilot's answer to 'who is the CEO of X' reflects the correction by the next query.
  • A crisis-response statement goes live on the company's newsroom; IndexNow ensures the statement is searchable on Bing within minutes, ahead of any hostile coverage being indexed.

Also known as

push indexing · instant indexing protocol