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

SEOlizer bot

The SEOlizer bot is a specialized SEO crawler designed to analyze websites for technical optimization and competitive positioning. Its presence in your logs indicates that your site is being analyzed, either by the tool's operator or an SEO professional using the platform, to gather data on technical SEO elements, site structure, and on-page optimization factors.

What is the SEOlizer bot?

The SEOlizer bot is a web crawler designed to analyze websites for SEO opportunities. It is a technical SEO tool that systematically collects data from websites to provide insights into their structure, performance, and competitive positioning. The crawler identifies itself in server logs with a user-agent string like SEOlizer/1.2 (...). The bot operates from German IP addresses and is focused on comprehensive domain analysis rather than AI-driven analytics.

Why is the SEOlizer bot crawling my site?

The SEOlizer bot is crawling your website to collect data for SEO analysis. It is examining your site's structure, checking for broken links, and analyzing meta tags and other on-page elements that impact search engine rankings. The crawler performs targeted crawls for specific analysis purposes rather than continuous monitoring. Its presence in your logs likely indicates that your site is being analyzed either by the tool's operator or by an SEO professional using the platform.

What is the purpose of the SEOlizer bot?

The purpose of the SEOlizer bot is to support SEO professionals by providing technical insights and competitive analysis. The crawler examines websites to identify optimization opportunities and potential issues that can affect search engine rankings. The data it collects is used to generate reports on technical SEO factors, which helps SEO professionals make data-driven decisions. For website owners, the analysis can provide value by identifying issues like duplicate content or broken links that might otherwise go unnoticed.

How do I block the SEOlizer bot?

To prevent the SEOlizer bot from analyzing your site, you can add a disallow rule to your robots.txt file. This is the standard method for managing access for SEO crawlers.

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

User-agent: SEOlizer
Disallow: /

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

Reverse IP lookup technique

To verify user-agent authenticity, you can use host linux command two times with the IP address of the requester.

```
> host IPAddressOfRequest
```
This command returns the reverse lookup hostname (e.g., 4.4.8.8.in-addr.arpa.).

> host ReverseDNSFromTheOutputOfFirstRequest

If the output matches the original IP address and the domain is associated with a trusted operator (e.g., SEOlizer), 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.