Published on 2025-08-07T06:18:08Z

SeznamBot

SeznamBot is the official web crawler for Seznam.cz, the leading search engine in the Czech Republic. Its purpose is to discover and index public web content to build Seznam's search database. For website owners, particularly those targeting the Czech market, being indexed by SeznamBot is crucial for gaining visibility and organic traffic from a Central European audience.

What is SeznamBot?

SeznamBot is the web crawler for Seznam.cz, the top search engine in the Czech Republic. It is a traditional indexing crawler that systematically browses the web to discover and index content for Seznam's search results. The bot identifies itself in server logs with a user-agent string like Mozilla/5.0 (compatible; SeznamBot/3.2; +http://napoveda.seznam.cz/en/seznambot-intro/). It behaves like other major search engine crawlers, following links and respecting robots.txt directives, and is essential for maintaining Seznam's competitive position in the Czech search market.

Why is SeznamBot crawling my site?

SeznamBot is crawling your site to index its content for inclusion in Seznam.cz's search results. If your site is being visited by the bot, it is being considered for Seznam's search index, which can bring traffic from users in the Czech Republic. The frequency of visits depends on your site's popularity and relevance to Seznam's user base. Sites with Czech-language content or those targeting Central European audiences are likely to see more frequent crawling. This is a standard and authorized activity for a search engine.

What is the purpose of SeznamBot?

The purpose of SeznamBot is to support the Seznam.cz search engine by collecting and indexing web content. The data it gathers allows Seznam to provide relevant search results to its users, who are primarily in the Czech Republic. For website owners, being crawled by the bot provides the benefit of visibility in Seznam's search results. This is particularly valuable for businesses targeting Czech-speaking audiences or operating in Central European markets where Seznam has a strong presence.

How do I block SeznamBot?

To prevent SeznamBot from accessing your website, you can add a disallow rule to your robots.txt file. This will prevent your pages from appearing in Seznam's search results.

To block this bot, add the following lines to your robots.txt file:

User-agent: SeznamBot
Disallow: /

How to verify the authenticity of the user-agent operated by Seznam.cz?

Reverse IP lookup technique

To verify user-agent authenticity, you can use host linux command two times with the IP address of the requester.
  1. > host IPAddressOfRequest
    This command returns the reverse lookup hostname (e.g., 4.4.8.8.in-addr.arpa.).
  2. > host ReverseDNSFromTheOutputOfFirstRequest
If the output matches the original IP address and the domain is associated with a trusted operator (e.g., Seznam.cz), the user-agent can be considered legitimate.

IP list lookup technique

Some operators provide a public list of IP addresses used by their crawlers. This list can be cross-referenced to verify a user-agent's authenticity. However, both operators and website owners may find it challenging to maintain an up-to-date list, so use this method with caution and in conjunction with other verification techniques.