What we observed
Looking at swi-prolog.org from the outside, the most important data points are its hosting country (Germany), the SSL state (OK) and the registration footprint (Key-Systems GmbH).
Encryption (HTTPS)
HTTPS check returned OK. A valid TLS certificate is the bare minimum any modern site should ship — its absence is a serious red flag.
Time on the open web
swi-prolog.org has been visible to public DNS for roughly 24.5 years. That is enough history to leave a reputation footprint, which we factor into the score.
Hosting & infrastructure
The domain currently resolves to a server in Germany, served by Unknown. Hosting location does not equal trust, but it tells you which jurisdiction handles the data.
Comparable domains
Sites with similar metadata to swi-prolog.org — 24.5 yrs, Germany hosting, valid SSL — typically include both legitimate businesses and rebranded shells. Treat the score as one signal among several.
Conclusion
After fusing DNS, TLS, RDAP and GeoIP signals, our automated score for swi-prolog.org sits at 100/100 (very_safe). Use it as a guideline, not a guarantee.