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clark.ed.jp

通信制高校 | クラーク記念国際高等学校

Last scanned Jul 27, 2026, 3:43 PM

82

Overall score

Great

Summary

クラーク記念国際高等学校は1992年開校、1万人以上の生徒が学ぶ通信制高校です。「夢・挑戦・達成」をモットーに、一人ひとりが興味のあることを学べる多彩な��… This website uses WordPress hosted on Cloudflare behind Cloudflare CDN. SEO is excellent (95/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance fair (70/100). Top issue: Meta description longer than 160 characters.

クラーク記念国際高等学校は1992年開校、1万人以上の生徒が学ぶ通信制高校です。「夢・挑戦・達成」をモットーに、一人ひとりが興味のあることを学べる多彩なコースや授業が充実。難関大学にも毎年多数合格しています。

United States
Hosted on Cloudflare

Top issues to fix

5 issues found · 2 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

  • Meta description longer than 160 characters

    SEO

    Trim the meta description to under 160 characters to avoid truncation in search results.

95

SEO

1 issue(s) found

70

Performance

1.73 s

65

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

クラーク記念国際高等学校は1992年開校、1万人以上の生徒が学ぶ通信制高校です。「夢・挑戦・達成」をモットーに、一人ひとりが興味のあることを学べる多彩なコースや授業が充実。難関大学にも毎年多数合格しています。

X (Twitter)X (Twitter)InstagramYouTube

Contact

Email, phone, and address published on this site's own pages.

Meta tags

Title
通信制高校 | クラーク記念国際高等学校
Description
クラーク記念国際高等学校は1992年開校、1万人以上の生徒が学ぶ通信制高校です。「夢・挑戦・達成」をモットーに、一人ひとりが興味のあることを学べる多彩なコースや授業が充実。難関大学にも毎年多数合格しています。
Canonical
https://www.clark.ed.jp/
Language
ja
Charset
utf-8
Viewport
width=device-width, viewport-fit=cover
Robots meta
index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
トップページ
og:description
クラーク記念国際高等学校は1992年開校、1万人以上の生徒が学ぶ通信制高校です。「夢・挑戦・達成」をモットーに、一人ひとりが興味のあることを学べる多彩なコースや授業が充実。難関大学にも毎年多数合格しています。
og:type
website
og:url
https://www.clark.ed.jp/

Twitter Card

twitter:card
summary_large_image
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

WordPressCloudflare Analytics

Hosting & CDN

Hosting provider
Cloudflare
CDN provider
Cloudflare
IP address
104.20.18.156
ASN
AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)

DNS records

TypeValue
A
  • 104.20.18.156
  • 172.66.161.163
AAAA
  • 2606:4700:10::6814:129c
  • 2606:4700:10::ac42:a1a3
MX—
TXT—
NS—
CAA—
CNAME
  • www.clark.ed.jp.cdn.cloudflare.net
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Google Trust Services
Subject
www.clark.ed.jp
Valid from
Jul 12, 2026
Valid to
Oct 10, 2026
Days until expiry
74
SAN domains
www.clark.ed.jp

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyMissing
  • X-Frame-OptionsMissing
  • X-Content-Type-OptionsMissing
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 39 · H3 144

Links

277 internal · 20 external · 0 broken

Images

86 total · 0 missing alt

Scripts / Styles

28 scripts · 12 stylesheets

JS / CSS size

60.2 KB · 88.3 KB

Page size

343 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
1
sitemap.xml
Found
URLs in sitemap
-1

SEO issues

  • Meta description longer than 160 characters

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://clark.ed.jp
Final URL
https://www.clark.ed.jp/
HTTP status
200
HTTP version
HTTP/2
Response time
1.72 s
HTML size
343 KB
Redirect chain
https://clark.ed.jp → https://www.clark.ed.jp/

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Frequently asked questions

What technology does clark.ed.jp use?
clark.ed.jp is built with WordPress, Cloudflare Analytics.
Is clark.ed.jp secure (HTTPS)?
Yes. clark.ed.jp uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Oct 10, 2026.
Who hosts clark.ed.jp?
clark.ed.jp is hosted on Cloudflare, behind Cloudflare CDN.
What is clark.ed.jp's SEO score?
clark.ed.jp scored 95/100 for SEO in the latest analysis (excellent).
What is clark.ed.jp's overall website score?
clark.ed.jp has an overall SiteGraph score of 82/100, combining SEO, performance, security, and accessibility.