SeznamBot
User agent, robots.txt rules and blocking guide by Seznam
SeznamBot is Seznam's crawler that indexes pages for Seznam search in the Czech Republic.
Should you block SeznamBot?
AllowAllow SeznamBot unless it causes a measurable load problem.
- Search rankings
- Blocking a search engine crawler removes your pages from that search engine's results.
- AI visibility
- AI features built on that search index, such as Google AI Overviews and AI Mode on top of Googlebot, also lose access to your pages.
SeznamBot at a glance
- robots.txt token
SeznamBot- Operator
- Seznam
- What it does
- Crawls web pages for a search engine index.
- Follows robots.txt
- Yes
- Can be verified
- Yes, published IP list
- Source
- Official documentation
What is SeznamBot?
SeznamBot collects pages for Seznam.cz search results.
Seznam publishes SeznamBot’s IP ranges, and genuine crawler hostnames end in seznam.cz.
How to block or allow SeznamBot
Put the robots.txt rule in the file at the root of every domain and subdomain, for example https://example.com/robots.txt. The token SeznamBot is matched case-insensitively.
robots.txt: block
# Block SeznamBot
User-agent: SeznamBot
Disallow: /robots.txt: allow
# Allow SeznamBot
User-agent: SeznamBot
Allow: /robots.txt: partial
# Keep SeznamBot out of private areas only
User-agent: SeznamBot
Disallow: /wp-admin/
Disallow: /cart/
Disallow: /checkout/
Disallow: /my-account/
Allow: /Nginx
# Nginx: return 403 to SeznamBot
if ($http_user_agent ~* "(SeznamBot)") {
return 403;
}Apache
# Apache .htaccess: return 403 to SeznamBot
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} (SeznamBot) [NC]
RewriteRule .* - [F,L]Cloudflare WAF
# Cloudflare > Security > WAF > Custom rule, action: Block
(http.user_agent contains "SeznamBot")How to verify real SeznamBot traffic
Seznam publishes the IP ranges that SeznamBot uses. A request with the SeznamBot user agent from an IP outside that list is an impersonator. Official IP list (JSON).
Reverse DNS check: look up the request IP, confirm the hostname ends in seznam.cz, then look up that hostname and confirm it returns the same IP.
# 1. Reverse lookup: the hostname must end in seznam.cz
host REQUEST_IP
# 2. Forward lookup: must return the same REQUEST_IP
host HOSTNAME_FROM_STEP_1How to find SeznamBot in your server logs
Search the web server access log for the token. This command counts SeznamBot requests per URL on Nginx or Apache:
grep -i "SeznamBot" access.log | awk '{print $7}' | sort | uniq -c | sort -rn | head -20For a full report per AI bot, upload the log to the AI Log File Analyzer, a free tool by Justin Hà.
SeznamBot user agent string
The full user agent published for SeznamBot. Version numbers such as Chrome/W.X.Y.Z change over time, so match the token, not the whole string.
Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/)SeznamBot FAQ
SeznamBot identifies itself with the robots.txt token "SeznamBot". A typical request header reads: Mozilla/5.0 (compatible; SeznamBot/4.0; +https://o-seznam.cz/napoveda/vyhledavani/en/seznambot-crawler/)
Seznam states that SeznamBot follows robots.txt rules. Check the documented scope and any exceptions on this profile.
Blocking a search engine crawler removes your pages from that search engine's results. AI features built on that search index, such as Google AI Overviews and AI Mode on top of Googlebot, also lose access to your pages.
Add two lines to the robots.txt file at the root of each domain and subdomain: "User-agent: SeznamBot" followed by "Disallow: /". The token is case-insensitive. Changes can take up to 24 hours to be picked up.
Yes. Seznam publishes the IP ranges SeznamBot uses. Check the request IP against that list; a matching user agent from any other IP is an impersonator.
Search your server access log for "SeznamBot", for example with: grep -i "SeznamBot" access.log. The AI Log File Analyzer by Justin Hà counts visits per AI bot from an uploaded log file.
Last reviewed by Justin Hà. Source: Seznam crawler documentation.
See which of these bots actually reach your website
The AI Log File Analyzer by Justin Hà counts visits from GPTBot, ClaudeBot, PerplexityBot and other AI crawlers in your server log, for free. The GEO Technical Package sets up robots.txt, llms.txt and crawler access for AI search.
