SemrushBot-SWA user agent, IP ranges and robots.txt

Semrush operates SemrushBot-SWA, which its SEO Writing Assistant tool uses to check whether a URL is accessible. The robots.txt token is SemrushBot-SWA and the bot honors robots.txt. No verification method is documented. Semrush states it uses no consecutive IP blocks and documents no reverse-DNS suffix, so site owners identify the bot by its user agent token alone.

Semrush documents SemrushBot-SWA as a URL check rather than a site crawl. Its wording is that the token blocks SemrushBot from checking URLs on your site for the SWA tool, and that the SEO Writing Assistant uses the check to see if a URL is accessible. A site owner should therefore expect single requests to specific URLs rather than a walk across the site. The documentation gives no full user agent string for this variant, so the SemrushBot-SWA token in the user agent is the identifier to look for.

Blocking SemrushBot-SWA stops the SEO Writing Assistant from confirming that pages on the site are reachable, and allowing it lets that check succeed. Semrush does not say whether the check is user-initiated. JavaScript execution and the IP addresses the bot uses are undocumented. Semrush states it uses no consecutive IP blocks and gives no reverse-DNS suffix, so there is no way to confirm a request beyond the token, and a robots.txt Disallow for SemrushBot-SWA is the documented control.

Operator note. Semrush describes this token as a URL accessibility check rather than a site crawl ("checking URLs on your site"). The documentation does not explicitly say it is user-initiated. JavaScript execution and IP addresses are not documented.