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

Jugendschutzprogramm-Crawler

The Jugendschutzprogramm-Crawler is a specialized web crawler operated by JusProg, a German youth protection organization. Its purpose is to scan and analyze web content to determine its age-appropriateness according to German youth protection laws. The data it collects is used to create and maintain the dynamic filtering lists that power JusProg's parental control and school filtering software.

What is Jugendschutzprogramm-Crawler?

The Jugendschutzprogramm-Crawler (which translates to 'Youth Protection Program Crawler') is an intelligence-gathering bot from the German organization JusProg. Its function is to analyze web content for compliance with German youth protection standards. It identifies itself in server logs with a user-agent string like Jugendschutzprogramm-Crawler; Info: http://www.jugendschutzprogramm.de. The crawler employs a multi-layered approach to evaluate content, examining page structure, language, and embedded media. It maintains a moderate request rate and focuses on content analysis rather than comprehensive indexing.

Why is Jugendschutzprogramm-Crawler crawling my site?

This crawler is visiting your site to analyze its content and determine its suitability for different age groups under German youth protection standards. It is more likely to visit if your content is accessible from German-speaking regions or if you host user-generated content that might require age classification. The frequency of visits depends on your site's content profile and its relevance to youth protection concerns. Sites with rapidly changing content may see more frequent visits.

What is the purpose of Jugendschutzprogramm-Crawler?

The primary purpose of this crawler is to support JusProg's filtering software, which is used by parents, schools, and other institutions to implement age-appropriate content filtering. The crawler catalogs and evaluates websites to maintain the dynamic filtering lists that help protect minors from inappropriate online content. For website owners, the crawler's activity helps ensure that their content is correctly classified within these youth protection systems, allowing appropriate audiences to access it while protecting younger users.

How do I block Jugendschutzprogramm-Crawler?

If you wish to prevent this crawler from analyzing your site, you can add a disallow rule to your robots.txt file. This is the standard method for managing crawler access.

To block the Jugendschutzprogramm-Crawler, add the following lines to your robots.txt file:

User-agent: Jugendschutzprogramm-Crawler
Disallow: /

How to verify the authenticity of the user-agent operated by JusProg?

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., JusProg), 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.