decn.co.jp

https://decn.co.jp· First analyzed 20 May 2026· Updated 20 May 2026

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decn.co.jp

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

35.79.146.224

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Tokyo, Japan

ASN

AS16509

Organization

AWS EC2 (ap-northeast-1)

Server

Apache

Nameservers

ns-322.awsdns-40.com.ns-696.awsdns-23.net.ns-1360.awsdns-42.org.ns-1825.awsdns-36.co.uk.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.7 s10%

Speed Index

2.2 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

16.2 MB

101 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv5.9.1

cms

decnCustom

Technology Stack

14 Technologies Detected

Plugins

Contact Form 7

Contact Form 7 Multi Step Module

Responsive Lightbox Adrotate Pro

Libraries

jQueryv3.4.1

Underscore.js Lightbox

Analytics

CSS Frameworks

Icon Libraries

Advertising

Web Servers

Languages

SEO Analysis

D48/100

Meta Tags4/15

Content9/12

Headings3/8

Technical15/25

E-E-A-T0/7

Images1/7

Links4/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

decn.co.jpdecn.co.jp

日刊建設工業新聞

No description available for this page.

Title Length8 chars

Recommended: 50-60 chars (~49px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (65/68) — critical for accessibility and SEO

12 issues found

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Crawlability

Sitemap

Type: index

17 URLs

17 sub-sitemaps

robots.txt

4 rules

Local SEO

Local Search Readiness

3/100

Poor

1 14 2

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

Sponsored

AI & LLM Readiness

F31/100

Bot Access

20/25

Machine Read.

8/25

Schema Data

0/25

Citation

3/25

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

navheader/footer

Text ratio:5%

Words:381

Token eff.:Optimal

Sections/1K:44.6

Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.8w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

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.

66/100

Passed

Critical

Warnings

Images & Alt Text

15/20

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

Semantic Structure

13/20

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

4/15

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

4 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.

24/100

1.67 g

CO₂e / view

16.2 MB

Page Weight

Cleaner Than

New Visitor

1.91 g

Returning (cached)

955 mg

Annual (10K/mo)

200.6 kg

Emission Segments

Data Center

82 mg

Network

491 mg

Device

1.10 g

Resource Breakdown

JavaScript

461.3 KB

Images

15.3 MB

CSS

297.8 KB

HTML

93.2 KB

Other

17.5 KB

Green Hosting Verified

Amazon Web Services (AWS)

Provider Match

7 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

149d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

17.09.2025

Valid Until

16.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

decn.co.jp*.decn.co.jp

SHA-256 Fingerprint

25:6D:0A:97:AD:B5:30:AA:B2:75:10:23:76:B9:BA:6C:E7:40:A2:C2...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-type

text/html; charset=UTF-8

date

Wed, 20 May 2026 14:35:05 GMT

link

<https://www.decn.co.jp/wp-json/>; rel="https://api.w.org/"

server

Apache/2.4.37 (Red Hat Enterprise Linux) OpenSSL/1.1.1k

x-powered-by

PHP/7.4.27

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mf.z-hosts.com

Domain Information

decn.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.

65/100

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

1 recommendation

•Mobile compatibility recommendation preview...

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Typography & Readability

Yu Gothic Medium

WCAG Partial

59/100

Readability

/30

18/30

14px · LH 1.50

Hierarchy

/20

8/20

WCAG

/25

17/25

3.84:1 min contrast

Performance

/25

16/25

1 font

Heading Font

Yu Gothic Medium

Sans

Body Font

Yu Gothic Medium

Sans14px

Contrast Ratio

3.84:1

4 issues

Reading Comfort

~62 CPL

Optimal (45–75)

18px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~62 chars/line (ideal 45–75 CPL).

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 4 elements below WCAG AA threshold (min 3.8:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

Buy on MyFontsFlesch 0

Color Palette

8 unique colors

4.53:1 AA Light

#ffffff

Background· 62.900000000000006%

#697a74

Other· 6%

#cedadf

Primary· 7.7%

#2e4056

Secondary· 6.1%

#93a7a2

Secondary· 6%

#d1be88

Secondary· 5.6%

#e9eae3

Secondary· 4.2%

#faea97

Accent· 1.5%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

decn.co.jp(14)securepubads.g.doubleclick.net(2)googletagmanager.com(1)

Website Identity

decn.co.jp

Location detected: 🇯🇵 Japanvia tld

Sponsored

Last analyzed: 20 May 2026 at 14:35

Historical Analysis & Change Tracking