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Domain report

trekhleb.dev

trekhleb.dev ranks in the top 0.43% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 1 distinct host observed under it.

Explore trekhleb.dev in the Web Graph

Connectivity

#577,058harmonic-centrality rank
Top percentile
0.43%
Hosts observed
1

From the Common Crawl cc-main-2026-jul-aug-sep hyperlink graph, 133,241,980 domains total. What this rank means

HTTPS reachability

200HTTP status

https://trekhleb.dev/ answered with HTTP 200.

DNS records

A
  • 185.199.108.153
  • 185.199.109.153
  • 185.199.110.153
  • 185.199.111.153
AAAA
No records found.
MX
  • 10 mx0.mail7.freehost.com.ua.
  • 10 mx1.mail7.freehost.com.ua.
  • 10 mx2.mail7.freehost.com.ua.
NS
  • ns-cloud-c1.googledomains.com.
  • ns-cloud-c2.googledomains.com.
  • ns-cloud-c3.googledomains.com.
  • ns-cloud-c4.googledomains.com.

Live preview

This is a live, sandboxed embed of trekhleb.dev — not a copy. What it shows can change any time the site itself does.

Domain registration (WHOIS / RDAP)

RDAP lookup failed (HTTP 429).

How to read WHOIS and RDAP data

SSL certificate

Certificate Transparency lookup failed (HTTP 429).

How to check when a certificate expires

HTTP & security headers

Response

Server
cloudflare
Content-Type
text/html; charset=utf-8
Cache-Control
max-age=600
Content-Encoding
Not sent

Security

Content-Security-Policy
Not sent
Strict-Transport-Security
Not sent
X-Frame-Options
Not sent
X-Content-Type-Options
Not sent
Referrer-Policy
Not sent
Permissions-Policy
Not sent

What each security header does

Redirect chain

  1. 1.http://trekhleb.dev/HTTP 301

    → https://trekhleb.dev/

  2. 2.https://trekhleb.dev/HTTP 200

Meta tags

Title
Oleksii Trekhleb | Senior Software Engineer @ Uber
Description
Oleksii Trekhleb — Senior Software Engineer @ Uber and author of the 197K-star javascript-algorithms repository. 28 open-source projects that help people learn, 43 articles on web development and machine learning, and 85 publications.
Canonical
https://trekhleb.dev/
Robots
Not set
Generator
Gatsby 5.10.0
Open Graph title
Oleksii Trekhleb | Senior Software Engineer @ Uber
Open Graph description
Oleksii Trekhleb — Senior Software Engineer @ Uber and author of the 197K-star javascript-algorithms repository. 28 open-source projects that help people learn, 43 articles on web development and machine learning, and 85 publications.
Open Graph image
https://trekhleb.dev/static-assets/images/site-meta-image-01.png
Open Graph type
profile
Twitter card
summary_large_image
Twitter title
Oleksii Trekhleb | Senior Software Engineer @ Uber
Twitter image
https://trekhleb.dev/static-assets/images/site-meta-image-01.png

robots.txt

Disallow rules (User-agent: *)
0
Disallow rules (other agents)
0

Sitemap declared:

  • https://trekhleb.dev/sitemap-index.xml

Technology detected

Best-effort, based on a small set of well-known signals — this may be incomplete.

  • Cloudflarecdn

    Server: cloudflare

  • Gatsbyframework

    Found "__gatsby" in the page's HTML

  • Google Analyticsanalytics

    Found "googletagmanager.com/gtag/js" in the page's HTML

Related domains

Similar connectivity

Domains ranked just above and below it in the same snapshot.