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dh-jac.net

https://dh-jac.net· First analyzed 03 Jun 2026· Updated 03 Jun 2026
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dh-jac.net
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Mobile

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Hosting Provider

K-Opticom Corporation

IP Address

219.75.130.178

Site Location

🇯🇵 Japanvia ip

Server Location

🇯🇵 Osaka, Japan

ASN

AS17511

Organization

K-Opticom Corporation

Server

Apache

Nameservers

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

Performance

96

Core Web Vitals

Weight

First Contentful Paint
1.1 s10%
Speed Index
1.4 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
440 KB
46 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
K-Opticom Corporation

Technology Stack

5 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

Libraries

1
jQueryv1.9.1

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Apache

SEO Analysis

D56/100
15
10
1
Meta Tags8/15
Content12/12
Headings6/8
Technical12/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile1/4
Indexability3/3
D
dh-jac.netdh-jac.net

International Joint Digital Archiving Center for Japanese Art and C...

アート・リサーチセンターは、私たち人類が持つ文化を後世に伝達するために、芸術、芸能、技術、技能を中心とした有形・無形の人間文化の所産を、歴史的、社会的観点から研究・分析し、記録・整理・保存・発信することを目的とした研究所です。

Title truncated.
Title Length130 chars

Recommended: 50-60 chars (~771px / 580px)

Description Length113 chars

Recommended: 120-160 chars

Issues (1)

  • • Title is too long (130 chars, ~771px). Will be truncated in search results.

11 issues found

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Crawlability

Sitemap
robots.txt

31 rules

Local SEO

Local Search Readiness

6/100
Poor
2 13 2

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

Sponsored

AI & LLM Readiness

D43/100
Bot Access
20/25
Machine Read.
12/25
Schema Data
0/25
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. lists
Text ratio:23%
Words:1,351
Token eff.:Optimal
Sections/1K:8.9
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary103w
Descriptive Headingsavg 4.8w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (9)
AI readiness recommendation preview...
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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.
B
74/100
10
Passed
4
Critical
1
Warnings
Images & Alt Text
15/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
14/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
15/15
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.
41/100
A
54 mg
CO₂e / view
440.1 KB
Page Weight
90%
Cleaner Than
New Visitor
62 mg
vs
Returning (cached)
31 mg
Annual (10K/mo)
6.5 kg
Emission Segments
Data Center
12 mg
Network
13 mg
Device
29 mg
Resource Breakdown
JavaScript
56.1 KB
Images
280.3 KB
CSS
86.6 KB
HTML
8.8 KB
Other
8.2 KB
Green Hosting Not Verified
K-Opticom Corporation
5 recommendations
  • •Carbon footprint recommendation preview...
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F

Security Score

36%Critical
Interactive

HTTPS

No WAF

150d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

SECOM Trust Systems Co., Ltd.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

16.04.2026

Valid Until

31.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.arc.ritsumei.ac.jp

SHA-256 Fingerprint

28:A0:27:53:BF:43:3A:5E:9B:D2:45:84:99:98:E1:4C:0C:5A:15:BF...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges
bytes
access-control-allow-credentials
true
content-length
625
content-type
text/html
date
Wed, 03 Jun 2026 01:35:41 GMT
etag
"271-6300a09c4a4de"
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

dh-jac.net

Domain Age
18y 3m

Created

29.02.2008

Expires

01.03.2034

Last Updated

12.02.2025

Registrar

GMO Internet Group, Inc. d/b/a Onamae.com

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

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.
D
54/100
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
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

ヒラギノ角ゴ Pro W6 + Arial

WCAG Partial
59/100
Readability
/30
10/30

13px · LH 1.80

Hierarchy
/20
15/20

1.54x ratio

WCAG
/25
14/25

1.68:1 min contrast

Performance
/25
20/25

System fonts

Heading Font

ヒラギノ角ゴ Pro W6

Sans20px

Body Font

Arial

Sans13px

Contrast Ratio

1.68:1

9 issues

Reading Comfort

~102 CPL

Too wide
20px
h1
18px
h2
18px
h3
13px
p

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

❌ Very long lines: ~102 chars/line causes eye strain. Add max-width constraint.

❌ Very complex text: Flesch score 27/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 9 elements below WCAG AA threshold (min 1.7:1).

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

✅ System fonts: Zero font loading delay — best possible LCP impact.

Buy on MyFontsFlesch 27

Color Palette

6 unique colors
Light
#ffffff
Background· 59.699999999999996%
#f7eef1
Primary· 17.8%
#885086
Secondary· 6.7%
#a78aa3
Secondary· 3.9%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

13 Resources

8
Scripts
5
Styles
3
Async
0
Defer

Top Script Sources

cse.google.com(2)local(2)googletagmanager.com(1)google.com(1)ajax.googleapis.com(1)

Website Identity

dh-jac.net

18 years old
Location detected: 🇯🇵 Japanvia ip
GMO Internet Group, Inc. d/b/a Onamae.comen

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Last analyzed: 03 Jun 2026 at 01:36

Historical Analysis & Change Tracking