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htmlvalidator.com

htmlvalidator.com ranks in the top 0.40% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 8 distinct hosts observed under it.

Explore htmlvalidator.com in the Web Graph

Connectivity

#536,753harmonic-centrality rank
Top percentile
0.40%
Hosts observed
8

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://htmlvalidator.com/ answered with HTTP 200.

DNS records

A
  • 172.67.176.216
  • 104.21.17.146
AAAA
  • 2606:4700:3033::6815:1192
  • 2606:4700:3031::ac43:b0d8
MX
  • 10 val.htmlvalidator.com.
NS
  • damon.ns.cloudflare.com.
  • kayleigh.ns.cloudflare.com.

Live preview

Screenshot of htmlvalidator.com

This site sends "X-Frame-Options: SAMEORIGIN", which blocks embedding it here.

Since htmlvalidator.com can't be embedded live, this is a captured screenshot instead — a snapshot from whenever it was last rendered, not necessarily this exact moment.

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
Not sent
Content-Encoding
Not sent

Security

Content-Security-Policy
default-src https: data: 'unsafe-eval' 'unsafe-inline'; manifest-src 'self'
Strict-Transport-Security
max-age=31536000; includeSubDomains
X-Frame-Options
SAMEORIGIN
X-Content-Type-Options
nosniff
Referrer-Policy
same-origin
Permissions-Policy
camera=(), microphone=()

What each security header does

Redirect chain

  1. 1.http://htmlvalidator.com/HTTP 301

    → https://htmlvalidator.com/

  2. 2.https://htmlvalidator.com/HTTP 302

    → https://www.htmlvalidator.com/

  3. 3.https://www.htmlvalidator.com/HTTP 200

Meta tags

Title
Powerful CSS & HTML Validation Software for Windows, Mac, and Linux ✅
Description
Download this software to help check and fix HTML, CSS, accessibility, links, SEO (search engine optimization), and more.
Canonical
https://www.htmlvalidator.com/
Robots
Not set
Generator
Not set
Open Graph title
CSS HTML Validator for Windows, Mac, and Linux
Open Graph description
Powerful and practical HTML, CSS, JavaScript, SEO, link, spelling, PHP, and accessibility checking software for Windows, Mac, and Linux.
Open Graph image
https://www.htmlvalidator.com/png/logo256x256.png
Open Graph type
Not set
Twitter card
summary
Twitter title
Not set
Twitter image
Not set

robots.txt

Disallow rules (User-agent: *)
0
Disallow rules (other agents)
31

No Sitemap declared in robots.txt.

Technology detected

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

  • Cloudflarecdn

    Server: cloudflare

Related domains

Similar connectivity

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