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Domain report

den.dev

den.dev ranks in the top 0.41% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 3 distinct hosts observed under it.

Explore den.dev in the Web Graph

Connectivity

#544,749harmonic-centrality rank
Top percentile
0.41%
Hosts observed
3

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://den.dev/ answered with HTTP 200.

DNS records

A
  • 104.21.42.42
  • 172.67.156.25
AAAA
  • 2606:4700:3033::ac43:9c19
  • 2606:4700:3036::6815:2a2a
MX
  • 1 aspmx.l.google.com.
  • 10 aspmx2.googlemail.com.
  • 10 aspmx3.googlemail.com.
  • 5 alt1.aspmx.l.google.com.
  • 5 alt2.aspmx.l.google.com.
NS
  • aleena.ns.cloudflare.com.
  • mark.ns.cloudflare.com.

Live preview

This is a live, sandboxed embed of den.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
public, max-age=300, s-maxage=86400
Content-Encoding
Not sent

Security

Content-Security-Policy
Not sent
Strict-Transport-Security
max-age=31536000; includeSubDomains
X-Frame-Options
Not sent
X-Content-Type-Options
nosniff
Referrer-Policy
strict-origin-when-cross-origin
Permissions-Policy
Not sent

What each security header does

Redirect chain

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

    → https://den.dev/

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

Meta tags

Title
Den Delimarsky - Tinkerer, Nerd, Pixel Geek
Description
Den Delimarsky is a Lead Maintainer of the Model Context Protocol. He writes about protocol design, security, reverse engineering, and Halo deep-dives.
Canonical
https://den.dev/
Robots
Not set
Generator
Hugo 0.163.3
Open Graph title
Den Delimarsky - Tinkerer, Nerd, Pixel Geek
Open Graph description
Den Delimarsky is a Lead Maintainer of the Model Context Protocol. He writes about protocol design, security, reverse engineering, and Halo deep-dives.
Open Graph image
https://assets.den.dev/images/shared/header_utag.webp
Open Graph type
website
Twitter card
summary_large_image
Twitter title
Not set
Twitter image
https://assets.den.dev/images/shared/header_utag.webp

robots.txt

Disallow rules (User-agent: *)
1
Disallow rules (other agents)
0

Sitemap declared:

  • https://den.dev/sitemap.xml

Technology detected

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

  • Cloudflarecdn

    Server: cloudflare

  • Hugoframework

    <meta name="generator"> = "Hugo 0.163.3"

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