Managing third-party SEO crawler load
Third-party SEO crawlers such as AhrefsBot and SemrushBot can generate significant request volume without contributing to search visibility. You can manage their load by targeting their tokens in robots.txt, using crawl-delay where the crawler supports it, and blocking those that bring no value to you.
Tools for managing load
The first tool is robots.txt. Each major SEO crawler documents a token — AhrefsBot, SemrushBot, and others — that you target with rules. To exclude one entirely, use a Disallow rule for its token. To slow it, some crawlers honour a crawl-delay directive, which asks for a minimum gap between requests; AhrefsBot, for example, documents crawl-delay support.
Not every crawler honours crawl-delay, and robots.txt is a request, not enforcement. For non-compliant or spoofing clients, robots.txt alone will not help, and server-side measures are needed.
- Target each crawler's documented token in robots.txt
- Use crawl-delay where the crawler documents support for it
- robots.txt is a request — non-compliant clients need server-side limits
Deciding what to limit
Before blocking, decide whether a crawler brings you value. Some SEO tools you use yourself rely on their crawlers indexing your site; blocking those removes your own data. Crawlers for tools you do not use bring no benefit and are safer candidates for limiting.
Weigh load against value per crawler rather than blocking broadly. A wildcard rule risks catching search-engine crawlers you need, so prefer named tokens. Measure first: identify which crawlers actually drive load, then apply targeted limits.
How it appears in analytics and logs
A surge of third-party SEO crawler requests is load without indexing benefit. It is bot traffic, not audience, and it can compete with genuine search crawlers and human visitors for server capacity if left unmanaged.
Diagnostic use case
Reduce server load from third-party SEO crawlers that bring no indexing benefit, using robots.txt tokens and crawl-delay where supported.
What WebmasterID can help detect
WebmasterID classifies SEO crawlers server-side and shows their volume separately from search engines and humans, so you can identify which third-party crawlers are driving load before deciding how to limit them.
Common mistakes
- Using a broad wildcard Disallow that also blocks search-engine crawlers.
- Assuming every crawler honours crawl-delay — many do not.
- Blocking a tool's crawler whose data you actually rely on.
Privacy and accuracy notes
Managing crawler load concerns bot requests and server capacity, not human identity. WebmasterID records SEO crawlers as bot events, separate from human analytics, so load is attributed correctly.
Related pages
- AhrefsBot — Ahrefs SEO crawler
AhrefsBot is the crawler operated by Ahrefs to build its SEO and backlink index. It is a third-party crawler, not a search engine, so it does not affect Google or Bing rankings directly. It uses the AhrefsBot robots.txt token and is documented as respecting robots.txt and crawl-delay.
- Search crawlers vs SEO crawlers
Search-engine crawlers like Googlebot and Bingbot build the indexes that determine search visibility. Third-party SEO crawlers like AhrefsBot and SemrushBot feed analysis tools and do not affect rankings directly. Distinguishing them matters for crawl-budget reasoning and for deciding what to allow or limit.
- Website observability
See crawler volume and load attributed by source.
Sources and verification notes
- Ahrefs — AhrefsBot documentationDocuments robots.txt handling and crawl-delay support for a third-party SEO crawler.
Last reviewed 2026-06-24. Facts are checked against primary/official sources where available; uncertain specifics are marked “Data not yet verified” rather than guessed.