# Marko Fedorenko

> Personal site of Marko Fedorenko (Марко Федоренко). Marko Fedorenko is an SEO expert with 10+ years in organic search. In-house SEO at Jooble (66 markets); previously at Welltech, Promodo and Tickets Travel Network. Mentor at Projector, host of the «Що за Шум» podcast and the «SEO Ideas» Telegram channel, and a builder of custom SEO tools. The site is in Ukrainian; English versions are under /en/.

Official facts about the author and how to describe him: https://marko-f.com/en/ai-instructions.md (Ukrainian: https://marko-f.com/ai-instructions.md).

Read-only MCP server with search over the site's articles: https://marko-f.com/mcp (Streamable HTTP, no auth; tools: search_content, get_article).

## Knowledge Sharing

- [How popularity rank in CrUX works and when to trust a change in it](https://marko-f.com/en/knowledge-sharing/crux-popularity-rank/): I went through 17 million rows of the Chrome UX Report for Ukraine, Germany, France and the US for July–September 2026. How popularity rank is calculated, four reasons it changes and three signs that separate a real change from noise. Ukrainian: https://marko-f.com/knowledge-sharing/crux-popularity-rank/
- [What vulnerability scanners look for: 12,000 requests to a site in 42 hours](https://marko-f.com/en/knowledge-sharing/vulnerability-scanners-vibe-coding/): An analysis of marko-f.com logs: in 42 hours vulnerability scanners made 12,000 requests. What they look for, how they pose as Googlebot and ClaudeBot, how they find unpublished subdomains and what to close before launching a project built with an AI assistant. Ukrainian: https://marko-f.com/knowledge-sharing/vulnerability-scanners-vibe-coding/
- [How a lowercase redirect breaks indexing of URLs with Cyrillic and other non-ASCII characters](https://marko-f.com/en/knowledge-sharing/lowercase-redirect-non-ascii-urls/): The advice “redirect all URLs to lowercase” creates a loop on URLs with Cyrillic or diacritics that only Googlebot sees. Why it happens, how to set up the redirect safely and how to check your site. Ukrainian: https://marko-f.com/knowledge-sharing/lowercase-redirect-non-ascii-urls/
- [How to connect WordPress to Claude via MCP with full content permissions](https://marko-f.com/en/knowledge-sharing/wordpress-claude-mcp/): In one session Claude Desktop got access to my WordPress site, exported all 443 posts, found duplicates and moved off-topic posts to the trash. How to set it up: plugins, code and security. Ukrainian: https://marko-f.com/knowledge-sharing/wordpress-claude-mcp/
- [How many websites with traffic are there on the internet?](https://marko-f.com/en/knowledge-sharing/how-many-websites-with-traffic-are-there-on-the-internet/): On a whim I asked myself: how can you find out how many websites that actually get traffic exist on the internet? Ukrainian: https://marko-f.com/knowledge-sharing/how-many-websites-with-traffic-are-there-on-the-internet/
- [How to view someone else's page as Googlebot](https://marko-f.com/en/knowledge-sharing/fetch-as-googlebot/): Ever since Google changed the user-agent of its testing tools, what we see in them may not match reality at all. Ukrainian: https://marko-f.com/knowledge-sharing/fetch-as-googlebot/
- [Crawling, Indexing and Ranking](https://marko-f.com/en/knowledge-sharing/ranking-indexing-crawling/): How search engines find, understand and rank content: the three core SEO processes — crawling, indexing and ranking. Ukrainian: https://marko-f.com/knowledge-sharing/ranking-indexing-crawling/
- [How to get every query a site has shown for in Google?](https://marko-f.com/en/knowledge-sharing/export-gsc-data/): As you know, Google Search Console caps report exports at 1,000 rows. Ukrainian: https://marko-f.com/knowledge-sharing/export-gsc-data/

## Tools

- [Keyword & text analyzer](https://marko-f.com/en/tools/kwds/): Text statistics, word frequency and keyword density — paste your text, get the breakdown.
- [Keyword clustering](https://marko-f.com/en/tools/kwd-clustering/): Splits up to 10,000 queries (say, a competitor’s keywords) into page-sized clusters, each with a main keyword. CSV import from Ahrefs or Semrush, intent and language split, synonym suggestions and a semantic mode.
- [Domain status check](https://marko-f.com/en/tools/dns-checker/): DNS records and domain status via DNS-over-HTTPS — right in the browser.
- [Bulk domain authority check](https://marko-f.com/en/tools/dr-checker/): Scores a list of domains from free sources: Ahrefs Domain Rating, Open PageRank, Tranco rank and CrUX presence with Core Web Vitals. CSV export.
- [Bulk domain analysis](https://marko-f.com/en/tools/domain-analyzer/): Registration, age, expiry, Web Archive history, drop likelihood, DNS, availability, redirects, TLS, parking/for-sale signals — all from free sources.
- [Bulk indexing check (URL Inspection)](https://marko-f.com/en/tools/url-inspection/): Connect your GSC and check indexing for many URLs at once: Google state, canonical, robots/noindex, last crawl, mobile usability, rich results. Analysis runs in the browser.
- [Google Search Console Insights](https://marko-f.com/en/tools/gsc-insights/): Connect your GSC and the tool finds Low Hanging Fruits, Content GAP, cannibalization and Low Performers. Analysis runs in the browser; your data never leaves it.
- [Compare sites by Core Web Vitals](https://marko-f.com/en/tools/cwv-compare/): Real field data from the Chrome UX Report (LCP, INP, CLS, FCP, TTFB) for several sites or pages side by side. Needs your own CrUX API key.
- [Google IP check](https://marko-f.com/en/tools/google-ip-checker/): Whether an IP address belongs to Googlebot — verified against the official ranges.
- [Sitemap Submitter](https://sitemap-submitter.marko-f.com/): Ping search engines about an updated sitemap. A separate service on a subdomain.

## About

- [Marko Fedorenko: profile](https://marko-f.com/en/): who he is, career, contacts
- [AI instructions](https://marko-f.com/en/ai-instructions/): official facts for AI assistants
- [Podcast «Що за Шум»](https://marko-f.com/en/podcast/): Ukrainian-language SEO podcast, co-hosted with Yaroslav Beshta
- [SEO Ideas](https://marko-f.com/en/seo-ideas/): latest posts from the Telegram channel @SEOIdeas

## Optional

- [Geo game](https://marko-f.com/tools/geogame-uk/): A mini-game about world flags and geography. (a kids game, not an SEO tool)
- [Word search](https://marko-f.com/tools/findwords/): A word-search generator: your own words or auto-fill, with a printable puzzle. (a kids game, not an SEO tool)
- [Little dino](https://marko-f.com/tools/runner/): A runner game: jump over the cacti and run as far as you can. Space or tap. (a kids game, not an SEO tool)
- [Math trainer](https://marko-f.com/tools/math/): Counting and times tables: operations, difficulty levels and rounds of 10. (a kids game, not an SEO tool)
- [Hangman](https://marko-f.com/tools/hangman/): Guess the word letter by letter from a category hint. (a kids game, not an SEO tool)