Evidence report for perplexity.ai
Builder clues, stack, hosting, DNS, SSL, registrar, contact paths, and site-age signals for perplexity.ai.
perplexity.ai
Scanned 7/7/2026, 9:15:39 AM · public snapshot may be stale
Evidence summary
- Likely builder
- No direct builder credit found
- Stack
- Cloudflare
- Hosting/CDN
- Cloudflare
- Domain Rating
- DR 91/100
- Contact path
- visual assets, fonts
- Pages
- No sitemap, links, or humans.txt found
Lookup results
Hosting & Infrastructure
Domain Rating
91
Backlink profile strength on Ahrefs' 100-point logarithmic scale.
Site Freshness / Rebuild Clue
Wikipedia
Perplexity
Concept in information theory
In information theory, perplexity is a measure of uncertainty for a discrete probability distribution. The perplexity of a fair coin toss is 2, and that of a fair die roll is 6; and generally, for a probability distribution with exactly N outcomes each having a probability of exactly 1 / N, the perplexity is simply N. But perplexity can also be applied to unfair dice, and to other non-uniform probability distributions. It can be defined as the exponentiation of the distribution's information ent…
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