Is gakken.jp secure (HTTPS)?

Yes. gakken.jp uses TLS 1.3 with a certificate issued by GlobalSign nv-sa, valid until Dec 24, 2026.

Hosting provider information for gakken.jp is not available yet.

What is gakken.jp's SEO score?

gakken.jp scored 65/100 for SEO in the latest analysis (fair).

What is gakken.jp's overall website score?

gakken.jp has an overall SiteGraph score of 80/100, combining SEO, performance, security, and accessibility.

gakken.jp

お探しのページが見つかりません | 学研ホールディングス

Last scanned Jul 26, 2026, 4:17 PM

Overall score

Great

Summary

株式会社学研ホールディングス. This website uses Nginx. SEO is fair (65/100) and accessibility is excellent (95/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.

株式会社学研ホールディングス

Top issues to fix

13 issues found · 3 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 viewport meta tag
Accessibility
Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
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.
2 cookies without Secure/HttpOnly flags
Security
Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.

+7 more issues — details in the sections below.

SEO

6 issue(s) found

100

Performance

280 ms

Security

HTTPS & header checks

Accessibility

1 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.

株式会社学研ホールディングス

Meta tags

Title: お探しのページが見つかりません | 学研ホールディングス
Description: 株式会社学研ホールディングス
Canonical
Language: ja
Charset: UTF-8
Viewport
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Nginx

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: GlobalSign nv-sa
Subject: *.gakken.jp
Valid from: Jun 8, 2026
Valid to: Dec 24, 2026
Days until expiry: 148
SAN domains: *.gakken.jp, gakken.jp

Security headers

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

Compression: gzip · 2 cookie(s) observed

Content & assets

Headings

H1 1 · H2 0 · H3 0

Links

2 internal · 6 external · 8 broken

Images

3 total · 0 missing alt

Scripts / Styles

0 scripts · 2 stylesheets

JS / CSS size

0 B · 106 B

Page size

5.0 KB

Robots.txt & Sitemap

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

SEO issues

Title longer than 60 characters
Missing canonical link
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://gakken.jp
Final URL: https://www.gakken.jp/
HTTP status: 404
HTTP version: HTTP/1.1
Response time: 280 ms
HTML size: 5.0 KB
Redirect chain: https://gakken.jp → https://www.gakken.jp/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does gakken.jp use?: gakken.jp is built with Nginx.
Is gakken.jp secure (HTTPS)?: Yes. gakken.jp uses TLS 1.3 with a certificate issued by GlobalSign nv-sa, valid until Dec 24, 2026.
Who hosts gakken.jp?: Hosting provider information for gakken.jp is not available yet.
What is gakken.jp's SEO score?: gakken.jp scored 65/100 for SEO in the latest analysis (fair).
What is gakken.jp's overall website score?: gakken.jp has an overall SiteGraph score of 80/100, combining SEO, performance, security, and accessibility.