SeznamBot
Seznam •
Since 1996
Quick Actions
Official Docs
What is SeznamBot?
SeznamBot is the web crawler for Seznam.cz, the Czech Republic's leading search engine and web portal. With significant market share in the Czech Republic, Seznam competes directly with Google in this market. SeznamBot is optimized for Czech language content but also indexes international websites. The crawler supports modern web technologies, respects robots.txt, and maintains high crawling standards. For businesses targeting Czech audiences, optimization for SeznamBot is essential as Seznam remains a major player in the Czech digital ecosystem.
User Agent String
Mozilla/5.0 (compatible; SeznamBot/4.0; +http://napoveda.seznam.cz/seznambot-intro/)
How to Control SeznamBot
Block Completely
To prevent SeznamBot from accessing your entire website, add this to your robots.txt file:
# Block SeznamBot
User-agent: SeznamBot
Disallow: /
Block Specific Directories
To restrict access to certain parts of your site while allowing others:
User-agent: SeznamBot
Disallow: /admin/
Disallow: /private/
Disallow: /wp-admin/
Allow: /public/
Set Crawl Delay
To slow down the crawl rate (note: not all bots respect this directive):
User-agent: SeznamBot
Crawl-delay: 10
How to Verify SeznamBot
Verification Method:
Reverse DNS to seznam.cz
Reverse DNS to seznam.cz
Learn more in the official documentation.
Detection Patterns
Multiple ways to detect SeznamBot in your application:
Basic Pattern
/SeznamBot/iStrict Pattern
/^Mozilla/5\.0 \(compatible; SeznamBot/4\.0; \+http\://napoveda\.seznam\.cz/seznambot\-intro/\)$/Flexible Pattern
/SeznamBot[\s\/]?[\d\.]*?/iVendor Match
/.*Seznam.*SeznamBot/iImplementation Examples
// PHP Detection for SeznamBot
function detect_seznambot() {
$user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
$pattern = '/SeznamBot/i';
if (preg_match($pattern, $user_agent)) {
// Log the detection
error_log('SeznamBot detected from IP: ' . $_SERVER['REMOTE_ADDR']);
// Set cache headers
header('Cache-Control: public, max-age=3600');
header('X-Robots-Tag: noarchive');
// Optional: Serve cached version
if (file_exists('cache/' . md5($_SERVER['REQUEST_URI']) . '.html')) {
readfile('cache/' . md5($_SERVER['REQUEST_URI']) . '.html');
exit;
}
return true;
}
return false;
}
# Python/Flask Detection for SeznamBot
import re
from flask import request, make_responsedef detect_seznambot():
user_agent = request.headers.get('User-Agent', '')
pattern = r'SeznamBot'
if re.search(pattern, user_agent, re.IGNORECASE):
# Create response with caching
response = make_response()
response.headers['Cache-Control'] = 'public, max-age=3600'
response.headers['X-Robots-Tag'] = 'noarchive'
return True
return False# Django Middleware
class SeznamBotMiddleware:
def __init__(self, get_response):
self.get_response = get_response
def __call__(self, request):
if self.detect_bot(request):
# Handle bot traffic
pass
return self.get_response(request)
// JavaScript/Node.js Detection for SeznamBot
const express = require('express');
const app = express();// Middleware to detect SeznamBot
function detectSeznamBot(req, res, next) {
const userAgent = req.headers['user-agent'] || '';
const pattern = /SeznamBot/i;
if (pattern.test(userAgent)) {
// Log bot detection
console.log('SeznamBot detected from IP:', req.ip);
// Set cache headers
res.set({
'Cache-Control': 'public, max-age=3600',
'X-Robots-Tag': 'noarchive'
});
// Mark request as bot
req.isBot = true;
req.botName = 'SeznamBot';
}
next();
}app.use(detectSeznamBot);
# Apache .htaccess rules for SeznamBot# Block completely
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} SeznamBot [NC]
RewriteRule .* - [F,L]# Or redirect to a static version
RewriteCond %{HTTP_USER_AGENT} SeznamBot [NC]
RewriteCond %{REQUEST_URI} !^/static/
RewriteRule ^(.*)$ /static/$1 [L]# Or set environment variable for PHP
SetEnvIfNoCase User-Agent "SeznamBot" is_bot=1# Add cache headers for this bot
<If "%{HTTP_USER_AGENT} =~ /SeznamBot/i">
Header set Cache-Control "public, max-age=3600"
Header set X-Robots-Tag "noarchive"
</If>
# Nginx configuration for SeznamBot# Map user agent to variable
map $http_user_agent $is_seznambot {
default 0;
~*SeznamBot 1;
}server {
# Block the bot completely
if ($is_seznambot) {
return 403;
}
# Or serve cached content
location / {
if ($is_seznambot) {
root /var/www/cached;
try_files $uri $uri.html $uri/index.html @backend;
}
try_files $uri @backend;
}
# Add headers for bot requests
location @backend {
if ($is_seznambot) {
add_header Cache-Control "public, max-age=3600";
add_header X-Robots-Tag "noarchive";
}
proxy_pass http://backend;
}
}
Should You Block This Bot?
Recommendations based on your website type:
| Site Type | Recommendation | Reasoning |
|---|---|---|
| E-commerce | Allow | Essential for product visibility in search results |
| Blog/News | Allow | Increases content reach and discoverability |
| SaaS Application | Block | No benefit for application interfaces; preserve resources |
| Documentation | Allow | Improves documentation discoverability for developers |
| Corporate Site | Allow | Allow for public pages, block sensitive areas like intranets |
Advanced robots.txt Configurations
E-commerce Site Configuration
User-agent: SeznamBot
Crawl-delay: 5
Disallow: /cart/
Disallow: /checkout/
Disallow: /my-account/
Disallow: /api/
Disallow: /*?sort=
Disallow: /*?filter=
Disallow: /*&page=
Allow: /products/
Allow: /categories/
Sitemap: https://example.com/sitemap.xml
Publishing/Blog Configuration
User-agent: SeznamBot
Crawl-delay: 10
Disallow: /wp-admin/
Disallow: /drafts/
Disallow: /preview/
Disallow: /*?replytocom=
Allow: /
SaaS/Application Configuration
User-agent: SeznamBot
Disallow: /app/
Disallow: /api/
Disallow: /dashboard/
Disallow: /settings/
Allow: /
Allow: /pricing/
Allow: /features/
Allow: /docs/
Quick Reference
User Agent Match
SeznamBotRobots.txt Name
SeznamBotCategory
searchRespects robots.txt
Yes
Copied to clipboard!