Perplexity
Perplexity publishes IP prefix lists for PerplexityBot and Perplexity-User on perplexity.com - those feeds are authoritative for allowlisting.
Published ranges
PerplexityBot
Official feedIP prefix list published at www.perplexity.ai/perplexitybot.json (authoritative for allowlisting).
Perplexity-User
Official feedIP prefix list published at www.perplexity.ai/perplexity-user.json (authoritative for allowlisting).