j-n.co.jp

https://j-n.co.jp· First analyzed 13 May 2026· Updated 13 May 2026

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j-n.co.jp

Mobile

Sponsored

Hosting Provider

Yahoo Japan Corporation

IP Address

203.137.167.33

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Shirakawa, Japan

ASN

AS4694

Organization

Yahoo Japan Corporation

Server

Apache

Nameservers

04.dnsv.jp.01.dnsv.jp.02.dnsv.jp.03.dnsv.jp.

Performance

Core Web Vitals

Weight

First Contentful Paint

999 ms10%

Speed Index

1.3 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.3 MB

55 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

jippiCustom

Technology Stack

10 Technologies Detected

Analytics

Libraries

UI Components

Other

CSS Frameworks

Fonts

Adobe Fonts (Typekit)

Web Servers

Apache

Languages

PHPv7.4.33

Plugins

Ewww Image Optimizer

SEO Analysis

B74/100

Meta Tags7/15

Content10/12

Headings3/8

Technical24/25

E-E-A-T2/7

Images5/7

Links2/5

URL5/5

Social5/5

Freshness4/4

Mobile4/4

Indexability3/3

j-n.co.jpj-n.co.jp

実業之日本社

実業之日本社の公式ホームページです。書籍、コミックス、雑誌、デジタルコンテンツの情報を配信しています。各出版物のここだけのお話を特集・記事にてお読みいただけます。

Title Length6 chars

Recommended: 50-60 chars (~37px / 580px)

Description Length81 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

26 URLs

26 sub-sitemaps

robots.txt

4 rules

Sitemap reference found

Local SEO

Local Search Readiness

15/100

Poor

4 13

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

D53/100

Bot Access

20/25

Machine Read.

14/25

Schema Data

8/25

Citation

11/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

def. listsnavheader/footer

Text ratio:3%

Words:306

Token eff.:Optimal

Sections/1K:16.3

Depth:3/5

Structured Data

4 JSON-LD

Organization×1.1WebSiteBreadcrumbListSearchAction

sameAs entity links

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.4w

Canonical URL

Open Graph3/3

Twitter Card3/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (7)

AI readiness recommendation preview...

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Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

78/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

18/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

6/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

2 recommendations

•Accessibility recommendation preview...

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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

38/100

171 mg

CO₂e / view

1.3 MB

Page Weight

60%

Cleaner Than

New Visitor

195 mg

Returning (cached)

98 mg

Annual (10K/mo)

20.5 kg

Emission Segments

Data Center

38 mg

Network

41 mg

Device

92 mg

Resource Breakdown

JavaScript

82.6 KB

Images

1.2 MB

CSS

14.1 KB

HTML

13.2 KB

Green Hosting Not Verified

Yahoo Japan Corporation

6 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

134d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

28.08.2025

Valid Until

24.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.j-n.co.jpj-n.co.jp

SHA-256 Fingerprint

AD:3E:1C:3A:C6:22:E9:25:5D:8D:4C:2A:DE:65:48:D0:48:E9:80:70...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

13212

content-type

text/html; charset=UTF-8

date

Wed, 13 May 2026 07:34:57 GMT

keep-alive

timeout=2, max=100

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

alt3.aspmx.l.google.com

alt2.aspmx.l.google.com

alt4.aspmx.l.google.com

alt1.aspmx.l.google.com

+1 more

Domain Information

j-n.co.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

64/100

Mobile Friendly1 breakpoint

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=device-width, initial-scale=1.0, minimum-scale=1.0

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

vdl-v7mincho

WCAG AAA

77/100

Readability

/30

22/30

20px · LH 1.40

Hierarchy

/20

15/20

1.6x ratio

WCAG

/25

24/25

9.4:1 min contrast

Performance

/25

16/25

1 font

Heading Font

vdl-v7mincho

Sans32px

Body Font

vdl-v7mincho

Sans20px

Contrast Ratio

9.4:1

WCAG AAA (≥7:1)

Reading Comfort

~37 CPL

Narrow lines

32px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Optimal line spacing: 1.40 ratio (ideal range 1.4–1.6).

✅ Easy to read: Flesch score 90/100 — accessible to general audiences.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 9.4:1).

⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

✅ Lean font stack: 1 font families keeps load times fast.

AAdobe Fonts Buy on MyFontsFlesch 90

Color Palette

10 unique colors

14.65:1 AAA Light

#ffffff

Background· 44.099999999999994%

#26292a

Primary· 5.5%

#efe2cb

Accent· 25.3%

#a29781

Secondary· 6%

#161218

Text· 5.6%

#f5ea69

Accent· 4.9%

#6e272d

Secondary· 1.6%

#ded5a4

Secondary· 1.6%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

j-n.co.jp(3)googletagmanager.com(2)google-analytics.com(1)use.typekit.net(1)ajax.googleapis.com(1)

Website Identity

実業之日本社

Organization

www.j-n.co.jp/

Location detected: 🇯🇵 Japanvia tld

📧 Google Workspaceja

Sponsored

Last analyzed: 13 May 2026 at 07:35

Historical Analysis & Change Tracking