Caution SEO Tools

SemrushBot-OCOB

Operated by Semrush

Quick Facts

User-Agent:
SemrushBot-OCOB
Category:
SEO Tools
Operator:
Semrush
Safety:
Caution
Blocking Impact:
Varies - Evaluate before blocking
SEO Impact Score:
0/10

What is SemrushBot-OCOB?

A specific version of SemrushBot used for On-Page SEO Checker and other specific audit tools.

A specific version of SemrushBot used for On-Page SEO Checker and other specific audit tools. SemrushBot-OCOB is a commercial SEO analytics crawler operated by Semrush. It builds backlink graphs, crawls for technical SEO issues, and tracks keyword rankings. The user-agent SemrushBot-OCOB is well-known and respected in the SEO industry. Blocking it removes your domain from Semrush's index, preventing competitors from analysing your backlink profile via their platform. However, other Semrush users also lose visibility into links pointing TO your site - weigh this trade-off carefully.

What happens if you block SemrushBot-OCOB?

❓ **Impact Unknown** - The SEO consequences of blocking SemrushBot-OCOB are not fully documented. Before blocking, check your analytics to confirm whether this bot generates referral traffic, review your server logs for crawl frequency, and test in a staging environment if possible.
Consider blocking based on your content strategy.

How to block SemrushBot-OCOB with robots.txt

<code>User-agent: SemrushBot-OCOB</code> - Matching is case-insensitive. Robots.txt is fetched from the root of each subdomain separately.

Block completely (robots.txt)
User-agent: SemrushBot-OCOB Disallow: /
Allow all (robots.txt)
User-agent: SemrushBot-OCOB Allow: /
Block private only (robots.txt)
User-agent: SemrushBot-OCOB Disallow: /private/ Disallow: /api/ Disallow: /admin/ Allow: /
Nginx server block
# Nginx: Hard-block SemrushBot-OCOB if ($http_user_agent ~* "SemrushBot\-OCOB") { return 403 "Bot blocked"; }
Apache .htaccess
# Apache: Hard-block SemrushBot-OCOB SetEnvIfNoCase User-Agent "SemrushBot\-OCOB" bad_bot Order Allow,Deny Allow from all Deny from env=bad_bot
Meta robots tag
<meta name="robots" content="noindex, nofollow">
X-Robots-Tag header
X-Robots-Tag: noindex, nofollow

Is SemrushBot-OCOB safe to allow?

⚠️ **Use Caution with SemrushBot-OCOB.** While operated by Semrush for stated legitimate purposes, this bot collects your content for uses you may not want to support (commercial data aggregation). It generally respects robots.txt but may revisit pages more frequently than needed. Evaluate your content strategy: if you're concerned about your data being used for these purposes, block it.

What does SemrushBot-OCOB do?

Understanding SemrushBot-OCOB's purpose helps you decide whether to allow or block it.

  • Analyzes website structure and SEO health
  • Tracks backlinks and referring domains
  • Monitors keyword rankings and competitor analysis
  • Crawls sites for technical SEO audits
  • Generates reports for SEO professionals

Frequently Asked Questions

What is the official user-agent string for SemrushBot-OCOB?
The official user-agent string for SemrushBot-OCOB is: SemrushBot-OCOB. This is the exact string you must use in robots.txt, Nginx, Apache, or Cloudflare firewall rules to target this bot. User-agent matching in robots.txt is case-insensitive, but the string must be spelled correctly. You can verify that a request genuinely comes from SemrushBot-OCOB by performing a reverse-DNS lookup on the source IP - legitimate bots resolve back to their operator's domain.
Is SemrushBot-OCOB safe?
⚠️ **Use Caution with SemrushBot-OCOB.** While operated by Semrush for stated legitimate purposes, this bot collects your content for uses you may not want to support (commercial data aggregation). It generally respects robots.txt but may revisit pages more frequently than needed. Evaluate your content strategy: if you're concerned about your data being used for these purposes, block it.
Will blocking SemrushBot-OCOB hurt my SEO?
❓ **Impact Unknown** - The SEO consequences of blocking SemrushBot-OCOB are not fully documented. Before blocking, check your analytics to confirm whether this bot generates referral traffic, review your server logs for crawl frequency, and test in a staging environment if possible.
How do I block SemrushBot-OCOB in robots.txt?
Add the following lines to your /robots.txt file: 
User-agent: SemrushBot-OCOB
Disallow: /
This instructs SemrushBot-OCOB not to crawl any path on your site. The Disallow: / directive covers the entire domain including subfolders. To only block specific sections, replace / with the path (e.g., Disallow: /blog/). Note: robots.txt is publicly readable - any bot or human can inspect it at yourdomain.com/robots.txt.
Does SemrushBot-OCOB respect robots.txt?
⚠️ SemrushBot-OCOB may not always respect robots.txt. For guaranteed blocking, combine robots.txt with server-level rules (Nginx if/return 403, Apache SetEnvIf, or Cloudflare WAF).
How do I verify if SemrushBot-OCOB is crawling my site?
Search your web server access logs for the string SemrushBot-OCOB (case-insensitive grep: grep -i "SemrushBot-OCOB" /var/log/nginx/access.log). You can also check Google Search Console → Coverage → Crawl Stats for Googlebot variants. For SemrushBot-OCOB specifically, filter by user-agent in your log analysis tool (GoAccess, AWStats, etc.).
What is the crawl frequency of SemrushBot-OCOB?
Crawl frequency data for SemrushBot-OCOB is not publicly documented. Monitor your logs to understand actual visit patterns.
Can I block SemrushBot-OCOB from specific pages only?
Yes. Instead of a global Disallow: / you can restrict SemrushBot-OCOB to specific paths: 
User-agent: SemrushBot-OCOB
Disallow: /private/
Disallow: /staging/
Allow: /
This allows SemrushBot-OCOB everywhere except the listed paths. Path matching in robots.txt uses prefix matching - Disallow: /private/ blocks /private/page.html but NOT /public/private/.
Why would I want to block SemrushBot-OCOB?
There are two main reasons to block SemrushBot-OCOB: 1. **Competitive intelligence**: Semrush users (your competitors) can analyse your backlink profile, keyword rankings, and site structure. Blocking prevents this. 2. **Crawl budget**: If your site is large, SEO tool crawlers consume crawl bandwidth without contributing to search rankings. Blocking frees up server resources for search engine bots. The trade-off: you also become invisible in Semrush's backlink database, meaning links pointing TO your site from other domains won't appear in competitor reports either.

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