popsci.com
As of Nov 6, 2026, popsci.com's ads.txt lists 336 seller lines across 67 ad systems and its DMARC policy is quarantine.
Checked daily since Oct 31, 2026. JSON. Link to this check. Run this site? Remove or correct this report.
Checked Nov 6, 2026, 21:36 UTC
| File | Status | What the robot saw | Same since |
|---|---|---|---|
| ads.txt | REMOVED | 336 seller lines, 67 ad systems. 35 changes since Nov 6. See the changes | 2026-11-06 |
| app-ads.txt | SUCCESS | 370 seller lines, 70 ad systems. | 2026-11-03, first check |
| sellers.json | NOT_FOUND | Not found. The site answered 410. 36 lines have no matching seller at advertising.com, appnexus.com, blis.com, freewheel.tv, and 9 more. Evidence 146 lines not judged: the ad system's sellers.json could not be read. | 2026-11-05, first check |
| robots.txt | SUCCESS | Read. No rule names an AI crawler. | 2026-11-06, first check |
| llms.txt | SUCCESS | Published. Title: Popular Science: Awe\-inspiring science reporting, technology news, and DIY projects\. Skunks to space robots, primates to climates\. That's Popular Science, 150 years strong\.. | 2026-11-06, first check |
| DMARC | SUCCESS | p=quarantine. 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 |
35 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
popsci.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.