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In a one-day snapshot taken on September 23, 2026, SerpPrism found a Sitemap line in 54 of 71 usable robots.txt files from a hand-picked set of high-traffic sites. Seventeen had no Sitemap line. These results describe those files on that date—not all websites, and not necessarily the sites’ current configurations.
What did the 71-site snapshot find?
SerpPrism’s survey by Hongtao Ren examined robots.txt files fetched from 78 manually chosen, high-traffic domains across news, ecommerce, SaaS, developer, social, finance, education, and government categories on September 23, 2026. Seventy-one returned usable plain-text files. Two responses were HTML, and five files could not be read: four returned HTTP 403 or 418, and one returned 404. The fetch used curl directly and, where needed, through a local proxy; 46 usable files came directly and 25 through the proxy. Ren notes that this split was not evenly distributed across categories.
The files were parsed line by line with user-agent groups respected. The counts below are observations of those 71 files, not estimates for the web as a whole.
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|---|---|
| At least one Sitemap line | 54 of 71 (76%) |
| More than one Sitemap line | 26 of 71 |
| No Sitemap line | 17 of 71 (24%) |
| Crawl-delay in the wildcard (User-agent: *) group | 5 of 71 |
| A declared sitemap blocked by the same site’s Disallow rule | 0 of 71 |
The source’s domain list and parsing script are published with the SerpPrism article. Because robots.txt files can change, named-site examples below should be read as September 23, 2026 observations.
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Is a sitemap in robots.txt required?
No. A Sitemap line is one way to tell crawlers where a sitemap is; it is not required for a site to have a sitemap. In the snapshot, 17 files had no Sitemap line: Forbes, Amazon, Etsy, Shopify, GitHub, GitLab, Reddit, LinkedIn, Quora, npmjs.com, Python.org, Go.dev, Mozilla.org, W3.org, Ahrefs, Screaming Frog, and MIT.
That finding means only that the inspected robots.txt response did not declare a sitemap. Google also allows site owners to submit sitemaps through Search Console, and its documentation describes sitemap submission as a hint rather than a guarantee that Google will fetch or use the file. See Google’s sitemap guidance. To determine whether a site has submitted a sitemap, inspect its Search Console if you have access; the public robots.txt file alone cannot answer that.
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Does Google support Crawl-delay?
No. Google’s robots.txt specification says Google supports fields including user-agent, allow, disallow, and sitemap; other fields such as crawl-delay are not supported. A Crawl-delay line therefore should not be treated as a way to control Googlebot.
SerpPrism found Crawl-delay in the wildcard group of five sampled files: X, Tumblr, Vimeo, Semrush, and Search Engine Land. It also reported a separate GitHub group for AI crawlers—GPTBot, OAI-SearchBot, ClaudeBot, anthropic-ai, and PerplexityBot—with Crawl-delay: 1. Those are site-specific, date-bound observations. Crawler behavior and support for directives can differ, so do not assume that a rule documented for one crawler applies to another.
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Can a sitemap live on another domain?
Yes, under Google’s documented rules, a Sitemap URL in robots.txt can point to a different host. It must be a fully qualified URL, and a file can contain multiple Sitemap declarations. The survey recorded two cross-host examples: notion.so listed 11 sitemap URLs on www.notion.com, while trello.com listed one on a594014.sitemaphosting7.com.
A cross-host declaration is not, by itself, a protocol violation. It does create an operational dependency: the sitemap host must remain available and the published sitemap must remain current. Google’s requirements are described in its robots.txt documentation.
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What should I check in my own robots.txt?
- Request the exact file for the relevant site. robots.txt applies to a particular host, protocol, and port, and belongs in that host’s top-level directory. Check the response body as well as the status code. Google expects UTF-8 plain text, but says it attempts to parse an HTML response and extract rules while ignoring other content.
- Read rules in their user-agent groups. Confirm that a directive is in the group for the crawler you intend to affect. A rule for a named bot is not automatically a site-wide rule; Google documents its supported fields and parsing behavior in its robots.txt guide.
- Look for sitemap declarations without treating absence as proof. If there is no Sitemap line, check sitemap submission through Search Console or other discovery routes before concluding that no sitemap exists.
- Check that sitemap URLs are fully qualified and reachable. Multiple declarations and cross-host URLs are permitted by Google’s rules. SerpPrism observed HTTP sitemap URLs for theguardian.com and who.int; both reportedly redirected. Treat an HTTP declaration as a reason to verify the current destination and maintainability, not as proof that the sitemap failed.
- Match the control to your goal. Use robots.txt to manage crawler access, not as a reliable way to remove a URL from Google or protect private information.
In the snapshot, khanacademy.org and cdc.gov returned HTTP 200 with HTML at /robots.txt, which SerpPrism characterized as a soft 404. Google says it may parse HTML and extract rules while ignoring other content, so inspect the actual response rather than assuming every crawler treats HTML as a total failure.
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No. Google describes robots.txt as a way to tell crawlers which URLs they may access, mainly to manage crawling. It is not a dependable indexing-removal or privacy control: a blocked URL may still appear in Search, for example if it is discovered through links. To prevent indexing, allow Google to crawl the page and use a noindex directive. To protect confidential content, require authentication or use another access control. Google explains the distinction in its introduction to robots.txt.
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