Shadowserver
A security non-profit that scans the internet for vulnerable and exposed services, then notifies network owners for free.
| robots.txt token | Shadowserver |
| Respects robots.txt | Not applicable — address-space scanning |
| Verification | Published scanner ranges; reverse DNS resolves to *.shadowserver.org |
| Our recommendation | Allow — They scan to warn you — the most defensible scanner on the internet. |
Block Shadowserver with robots.txt
User-agent: Shadowserver
Disallow: /robots.txt is a request, not a wall — requests claiming to be Shadowserver from unverified networks should be treated as bad bots. How to verify crawlers by network →
See every Shadowserver request hitting your site — live, with per-bot allow / block / tarpit controls. Try TrafficDATA free (100K page views)