SplitSignalBot

Safe Block: Depends Verified robots.txt: Yes

Semrush crawler used for SplitSignal SEO A/B testing workflows.

Crawls sites for SplitSignal SEO A/B testing workflows.

Key facts

Source type: Unknown
Confidence: High
Last checked: 2026-04-03
Verification: Identify the documented user-agent; Semrush says not to block by IP because it does not use consecutive IP blocks.
Operator URL: https://www.semrush.com/bot/
Source URL: https://www.semrush.com/bot/
Spoofing risk: User-agent strings can be spoofed. Verify with the operator’s published guidance before allow-listing.

Official Semrush bot documentation lists SplitSignalBot separately in robots.txt examples.

User-agent: SplitSignalBot
Disallow: /

(http.user_agent contains "SplitSignalBot")

Advanced server rules

RewriteCond %{HTTP_USER_AGENT} SplitSignalBot [NC]
RewriteRule .* - [F,L]

if ($http_user_agent ~* "SplitSignalBot") { return 403; }

Semrush documents SplitSignalBot as the crawler to block when you want to stop Semrush’s SplitSignal tool from crawling your site for SEO A/B tests.

Identify the documented user-agent; Semrush says not to block by IP because it does not use consecutive IP blocks.
Official Semrush bot documentation lists SplitSignalBot separately in robots.txt examples.
Crawls sites for SplitSignal SEO A/B testing workflows.
User-agent strings can be spoofed. Verify with the operator’s published guidance before allow-listing.