Semrush Bot
Semrush documents SemrushBot behavior and robots.txt controls on semrush.com/bot. They advise against blocking the crawler by IP because egress is not confined to consecutive blocks. The maintained prefix list below is a reference snapshot of commonly observed Semrush ranges (useful for allowlists and forensics), not a complete or Semrush-endorsed deny list — use robots.txt user-agent rules when you need to restrict crawling.
Autonomous systems
BGP context
Semrush operates AS209366. Crawler traffic is also observed on Google Cloud (AS396982) and may traverse other providers at the edge; combine ASN context with Semrush’s bot documentation and your own traces rather than ASN-only blocking.
Third-party hosting & clouds
Google LLC (GCP)
SemrushBot egress is commonly seen from GCP addressing (AS396982) in addition to AS209366.
Published ranges
SemrushBot
Maintained feedMaintained IPv4 prefixes often associated with Semrush crawlers, exported as Google-style JSON at /feeds/semrush.json. Semrush’s official guidance is to manage access with robots.txt (and related user-agents), not IP blocks — treat this list as a reference aid for allowlisting or log correlation, and re-verify against Semrush if you depend on it for production policy.
Documentation
Published prefixes
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85.208.96.0/24 -
185.191.171.0/24 -
85.208.98.128/25 -
85.208.98.32/28 -
85.208.98.48/28