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

KStandBot

KStandBot is an intelligence-gathering web crawler for URL Classification, a service that scans and categorizes web content. The bot systematically evaluates websites every 72 hours to collect data on content, security configurations, and compliance with web standards. The information it gathers is used to maintain an up-to-date content classification database, which is used by third-party services for purposes like content filtering.

What is KStandBot?

KStandBot is the primary web crawler for URL Classification, a service that scans and categorizes web content. It functions as an intelligence-gathering bot, collecting data for its web scanning operations. The crawler identifies itself in server logs with user-agent strings like Mozilla/5.0 (...) KStandBot/1.0. It operates from a set of five static IP addresses and performs site evaluations approximately every 72 hours to keep its categorization records current. It is designed for compatibility with both modern and legacy web systems.

Why is KStandBot crawling my site?

KStandBot is visiting your website to collect data for its content categorization system. As part of its regular 72-hour scanning cycle, it analyzes your site's content structure, metadata, and security profile (such as SSL configurations) to maintain an up-to-date classification. This periodic review allows the service to track changes in website content and compliance with standards. The crawling is generally considered authorized as part of the normal operation of a web classification service.

What is the purpose of KStandBot?

The purpose of KStandBot is to support the URL Classification service, which helps categorize websites. The data it collects is processed by natural language processing algorithms to determine the nature of a site's content. This classification information is then used by various third-party services for applications like content filtering, security analysis, or market research. The primary value is for organizations that use this data, though website owners may benefit from having their site properly categorized in these systems.

How do I block KStandBot?

To prevent KStandBot from accessing your website, you can add a specific disallow rule to your robots.txt file. This is the standard method for instructing web crawlers not to visit your site.

Add the following lines to your robots.txt file to block KStandBot:

User-agent: KStandBot
Disallow: /

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

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., URL Classification), 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.