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Domain report

classi.jp

classi.jp ranks in the top 0.35% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 19 distinct hosts observed under it.

Explore classi.jp in the Web Graph

Connectivity

#462,159harmonic-centrality rank
Top percentile
0.35%
Hosts observed
19

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://classi.jp/ answered with HTTP 200.

DNS records

A
  • 18.155.75.29
  • 18.155.75.34
  • 18.155.75.107
  • 18.155.75.25
AAAA
No records found.
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
  • ns-1050.awsdns-03.org.
  • ns-1677.awsdns-17.co.uk.
  • ns-299.awsdns-37.com.
  • ns-970.awsdns-57.net.

Live preview

This is a live, sandboxed embed of classi.jp — 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=3600
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://classi.jp/HTTP 301

    → https://classi.jp/

  2. 2.https://classi.jp/HTTP 200

Meta tags

Title
Classi（クラッシー） - 学校教育のICT活用を支援するクラウドサービス
Description
Classiは、学校のICT化を多角的にサポートする教育プラットフォームです。PCやタブレット、スマートフォンにも対応し、中学校、高校、専門学校など多くの教育現場で活用されています。
Canonical
https://classi.jp
Robots
index, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1
Generator
Not set
Open Graph title
Classi（クラッシー） - 学校教育のICT活用を支援するクラウドサービス
Open Graph description
Classiは、学校のICT化を多角的にサポートする教育プラットフォームです。PCやタブレット、スマートフォンにも対応し、中学校、高校、専門学校など多くの教育現場で活用されています。
Open Graph image
https://classi.jp/wp-content/themes/classi-service/assets/img/common/ogp.png
Open Graph type
website
Twitter card
Not set
Twitter title
Not set
Twitter image
Not set

robots.txt

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

Sitemap declared:

  • https://classi.jp/sitemap_index.xml

Technology detected

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

  • Cloudflarecdn

    Server: cloudflare

  • WordPresscms

    Found "wp-content/" in the page's HTML

  • Google Tag Manageranalytics

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

Related domains

Similar connectivity

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