scientificamerican.com
As of Nov 6, 2026, scientificamerican.com's ads.txt lists 66 seller lines across 40 ad systems, its robots.txt blocks GPTBot, OAI-SearchBot, ChatGPT-User, ClaudeBot, and 6 more, and its DMARC policy is reject.
Checked daily since Oct 31, 2026. JSON. Link to this check. Run this site? Remove or correct this report.
Checked Nov 6, 2026, 21:35 UTC
| File | Status | What the robot saw | Same since |
|---|---|---|---|
| ads.txt | ADDED | 66 seller lines, 40 ad systems. 62 changes since Nov 6. See the changes | 2026-11-06 |
| app-ads.txt | NOT_FOUND | Not found. The site answered 404. | 2026-11-03, first check |
| sellers.json | NOT_FOUND | Not found. The site answered 404. 6 lines have no matching seller at google.com, lijit.com, and programmaticx.ai. Evidence 17 lines not judged: the ad system's sellers.json could not be read. | 2026-11-05, first check |
| robots.txt | SUCCESS | 30 rules for 10 AI crawlers. Blocks GPTBot, OAI-SearchBot, ChatGPT-User, ClaudeBot, and 6 more. | 2026-11-06, first check |
| llms.txt | NOT_FOUND | Not found. The site answered 404. | 2026-11-06, first check |
| DMARC | SUCCESS | p=reject, pct=100. Reports on. | 2026-11-06, first check |
| MTA-STS | NOT_FOUND | No MTA-STS record. | 2026-11-06, first check |
| BIMI | NOT_FOUND | No BIMI record. | 2026-11-06, first check |
| security.txt | NOT_FOUND | Not found. The site answered 404. | 2026-11-06, first check |
62 changes since Oct 31
ads.txt sellers on Nov 6.
ads.txt sellers on Nov 6.
ads.txt sellers on Nov 6.
See before and after
scientificamerican.com changed its ad sellers on Nov 6. Publisher Watch finds changes like this across 8,118 publishers. One email a day.
See Publisher Watch
These are the site's own public files, as fetched, with the date. The robot reports what is published. It does not judge compliance, approval, or intent. A failed fetch is a failed fetch, never a missing file.
Not checked: anything behind a login, account settings, or private feeds. Whether crawlers obey robots.txt. Business deals: a file line is not a contract.