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Domain report

kaisei.dev

kaisei.dev ranks in the top 8.62% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 1 distinct host observed under it.

Explore kaisei.dev in the Web Graph

Connectivity

#11,487,195harmonic-centrality rank
Top percentile
8.62%
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://kaisei.dev/ answered with HTTP 200.

Certificate until 2026-12-03C=US, O=Google Trust Services, CN=WE1

DNS records

A
  • 104.21.59.49
  • 172.67.213.206
AAAA
  • 2606:4700:3035::6815:3b31
  • 2606:4700:3030::ac43:d5ce
MX
  • 10 brownwolf34.sakura.ne.jp.
  • 50 fb.mail.gandi.net.
NS
  • mariah.ns.cloudflare.com.
  • noel.ns.cloudflare.com.
AS
Server in network CLOUDFLARENET, AS13335 · United States104.21.59.0/24, which holds 104.21.59.49

Live preview

This is a live, sandboxed embed of kaisei.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

Common name
kaisei.dev
Issuer
C=US, O=Google Trust Services, CN=WE1
Valid from
2026-09-04
Valid until
2026-12-03

Matches kaisei.dev exactly. Source: Certificate Transparency logs (crt.sh).

How to check when a certificate expires

HTTP & security headers

Response

Server
cloudflare
Content-Type
text/html
Cache-Control
public, max-age=0, must-revalidate
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://kaisei.dev/HTTP 200

Meta tags

Title
Kaisei's Home
Description
The homepage of Kaisei, an engineer.
Canonical
Not set
Robots
Not set
Generator
Not set
Open Graph title
Kaisei's Home
Open Graph description
The homepage of Kaisei, an engineer.
Open Graph image
Not set
Open Graph type
website
Twitter card
Not set
Twitter title
Not set
Twitter image
Not set

robots.txt

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

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

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