Safe Data Scrapers

yacybot

Operated by YaCy Community

Quick Facts

User-Agent:
yacybot
Category:
Data Scrapers
Operator:
YaCy Community
Safety:
Safe
Blocking Impact:
Low - No SEO ranking impact
SEO Impact Score:
2/10

What is yacybot?

The bot user-agent for YaCy crawler nodes.

The bot user-agent for YaCy crawler nodes. yacybot is a data aggregation crawler. Unlike search bots or AI crawlers, its purpose is typically to collect content for private datasets, price monitoring, or research. Blocking yacybot via robots.txt or at the server level has NO negative SEO impact. If you see excessive crawl volume from this bot in your logs, a hard block is recommended.

What happens if you block yacybot?

✅ **Minimal Impact** - Blocking yacybot has no meaningful effect on your search engine rankings or organic traffic.
Generally safe to allow; provides legitimate crawling value.

How to block yacybot with robots.txt

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

Block completely (robots.txt)
User-agent: yacybot Disallow: /
Allow all (robots.txt)
User-agent: yacybot Allow: /
Block private only (robots.txt)
User-agent: yacybot Disallow: /private/ Disallow: /api/ Disallow: /admin/ Allow: /
Nginx server block
# Nginx: Hard-block yacybot if ($http_user_agent ~* "yacybot") { return 403 "Bot blocked"; }
Apache .htaccess
# Apache: Hard-block yacybot SetEnvIfNoCase User-Agent "yacybot" 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 yacybot safe to allow?

Yes, yacybot is a **safe and legitimate** crawler. It is operated by YaCy Community, which publicly documents its crawler at an official URL and follows the Robots Exclusion Protocol (RFC 9309). The user-agent string yacybot is verifiable via reverse-DNS lookup on the crawling IP addresses. You can safely allow it unless you have a specific reason to block (e.g., AI training opt-out or SEO tool visibility).
Verify by reverse-DNS lookup: legitimate yacybot requests resolve to yacy-community's domain.

What does yacybot do?

Understanding yacybot's purpose helps you decide whether to allow or block it.

  • Extracts content, prices, or data from websites
  • May be used for competitive intelligence
  • Often operates without explicit permission
  • Can increase server load and bandwidth usage
  • May violate terms of service or copyright

Frequently Asked Questions

What is the official user-agent string for yacybot?
The official user-agent string for yacybot is: yacybot. 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 yacybot by performing a reverse-DNS lookup on the source IP - legitimate bots resolve back to their operator's domain.
Is yacybot safe?
Yes, yacybot is a **safe and legitimate** crawler. It is operated by YaCy Community, which publicly documents its crawler at an official URL and follows the Robots Exclusion Protocol (RFC 9309). The user-agent string yacybot is verifiable via reverse-DNS lookup on the crawling IP addresses. You can safely allow it unless you have a specific reason to block (e.g., AI training opt-out or SEO tool visibility).
Will blocking yacybot hurt my SEO?
✅ **Minimal Impact** - Blocking yacybot has no meaningful effect on your search engine rankings or organic traffic.
How do I block yacybot in robots.txt?
Add the following lines to your /robots.txt file: 
User-agent: yacybot
Disallow: /
This instructs yacybot 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 yacybot respect robots.txt?
Yes - yacybot is a well-behaved bot operated by YaCy Community. It fetches and parses /robots.txt before crawling any page, following RFC 9309.
How do I verify if yacybot is crawling my site?
Search your web server access logs for the string yacybot (case-insensitive grep: grep -i "yacybot" /var/log/nginx/access.log). You can also check Google Search Console → Coverage → Crawl Stats for Googlebot variants. For yacybot specifically, filter by user-agent in your log analysis tool (GoAccess, AWStats, etc.).
What is the crawl frequency of yacybot?
yacybot crawls at a moderate rate. If you notice excessive traffic in your logs, you can add a Crawl-delay directive: 
User-agent: yacybot
Crawl-delay: 10
(10 second delay between requests).
Can I block yacybot from specific pages only?
Yes. Instead of a global Disallow: / you can restrict yacybot to specific paths: 
User-agent: yacybot
Disallow: /private/
Disallow: /staging/
Allow: /
This allows yacybot everywhere except the listed paths. Path matching in robots.txt uses prefix matching - Disallow: /private/ blocks /private/page.html but NOT /public/private/.
Is yacybot causing high server load?
If yacybot is generating excessive requests, you can: 1. Add Crawl-delay: 30 below the User-agent directive in robots.txt. 2. Rate-limit the user-agent via Nginx's limit_req_zone or Apache's mod_ratelimit. 3. Block it outright at Cloudflare WAF with rule: http.user_agent contains "yacybot". 4. Use fail2ban to auto-block IPs exceeding request thresholds.

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