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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 Aug 5, 2026, 12:00 AM · 12 views

86

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 behind Cloudflare CDN. SEO is good (85/100) and accessibility is excellent (100/100). Security scores excellent (90/100) 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。

Top issues to fix

5 issues found · 1 high priority

  • Missing Content-Security-Policy header

    Security

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

  • Meta description longer than 160 characters

    SEO

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

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

  • sitemap.xml not found

    SEO

    Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

  • 2 broken links on the page

    SEO

    Fix or remove broken links — they waste crawl budget and erode user trust.

85

SEO

3 issue(s) found

70

Performance

2.52 s

90

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

+4 overall since Jul 27, 2026

Overall
86
SEO
85
Security
90
Performance
70
Accessibility
100

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 AnalyticsGoogle AdsMeta PixelTikTok Pixel

Hosting & CDN

Hosting provider
—
CDN provider
Cloudflare
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

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
66
SAN domains
www.clark.ed.jp

Security headers

  • Strict-Transport-SecurityEnabled
  • Content-Security-PolicyMissing
  • X-Frame-OptionsEnabled
  • X-Content-Type-OptionsEnabled
  • Referrer-PolicyEnabled
  • Permissions-PolicyEnabled

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 39 · H3 144

Links

277 internal · 20 external · 2 broken

Images

93 total · 2 missing alt

Scripts / Styles

70 scripts · 12 stylesheets

JS / CSS size

33.9 KB · 105 KB

Page size

344 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Meta description longer than 160 characters
  • robots.txt not found
  • sitemap.xml not found

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
2.51 s
HTML size
344 KB
Redirect chain
https://clark.ed.jp → https://www.clark.ed.jp/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does clark.ed.jp use?
clark.ed.jp is built with WordPress, Cloudflare Analytics, Google Ads, Meta Pixel, TikTok Pixel.
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?
Hosting provider information for clark.ed.jp is not available yet.
What is clark.ed.jp's SEO score?
clark.ed.jp scored 85/100 for SEO in the latest analysis (great).
What is clark.ed.jp's overall website score?
clark.ed.jp has an overall SiteGraph score of 86/100, combining SEO, performance, security, and accessibility.
Has clark.ed.jp's score changed over time?
clark.ed.jp's overall score has improved by 4 points (from 82 to 86) since Jul 27, 2026.