bridgestone.co.jp

https://bridgestone.co.jp· First analyzed 28 Apr 2026· Updated 28 Apr 2026

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bridgestone.co.jp

Mobile

Sponsored

Hosting Provider

Jpnic NET JP ERX

IP Address

133.208.167.30

Site Location

🇯🇵 中央区, Japanvia schema_nap

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS2518

Organization

Jpnic NET JP ERX

CDN

Akamai

WAF

Akamai

Nameservers

a26-65.akam.net.a24-65.akam.net.a10-65.akam.net.a11-64.akam.net.+2 more

Performance

Core Web Vitals

Weight

First Contentful Paint

1.6 s10%

Speed Index

2.1 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

7.2 MB

117 requests

Image Optimization

WebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Jpnic NET JP ERX

CDN

Akamai

Technology Stack

10 Technologies Detected

Fonts

Google Fonts Adobe Fonts (Typekit)

Analytics

Libraries

CSS Frameworks

Tag Managers

Advertising

Payments

Customer Support

SEO Analysis

D58/100

Meta Tags5/15

Content9/12

Headings3/8

Technical17/25

E-E-A-T2/7

Images5/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

bridgestone.co.jpbridgestone.co.jp

株式会社ブリヂストン企業サイト

ブリヂストンの企業サイト。タイヤ、化工品などの製品情報、会社情報、CSR情報、投資家情報、採用情報などをご紹介します。

Title Length16 chars

Recommended: 50-60 chars (~99px / 580px)

Description Length59 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

robots.txt

2 rules

Local SEO

Local Search Readiness

24/100

Needs Work

6 15

Sponsored

AI & LLM Readiness

F34/100

Bot Access

20/25

Machine Read.

5/25

Schema Data

3/25

Citation

6/25

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:2%

Words:210

Token eff.:Too Short

Sections/1K:23.8

Depth:3/5

Structured Data

1 JSON-LD

Organization×1.1

sameAs entity links

Citation Readiness

Opening Summary

Descriptive Headingsavg 1w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (10)

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.

70/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

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

3/15

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

3 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.

22/100

914 mg

CO₂e / view

7.2 MB

Page Weight

Cleaner Than

New Visitor

1.04 g

Returning (cached)

522 mg

Annual (10K/mo)

109.6 kg

Emission Segments

Data Center

204 mg

Network

219 mg

Device

490 mg

Resource Breakdown

JavaScript

85.4 KB

Images

3.7 MB

CSS

3.3 MB

HTML

10.5 KB

Other

61.4 KB

Green Hosting Not Verified

Jpnic NET JP ERX

7 recommendations

•Carbon footprint recommendation preview...

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Security Score

25%Critical

Critical / Transactional

HTTPS

WAF

227d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

10.12.2025

Valid Until

11.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (5)

www.bridgestone.co.jpbridgestone.co.jpms.bridgestone.co.jptire.bridgestone.co.jpwww.bridgestone.com

SHA-256 Fingerprint

01:04:A6:3A:82:38:6B:FC:4D:B1:67:F9:A7:30:52:1C:3B:B7:6A:D3...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🟡 0s(max-age=0)

content-encoding

⚡ Brotli(br)

content-length

10444

content-type

text/html

date

Tue, 28 Apr 2026 05:05:43 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

Domain Information

bridgestone.co.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

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.

52/100

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, minimum-scale=1, maximum-scale=1, user-scalable=no

4 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

BridgestoneTypeTP-Regular

WCAG Partial

55/100

Readability

/30

17/30

14px · LH 1.64

Hierarchy

/20

7/20

WCAG

/25

16/25

1:1 min contrast

Performance

/25

15/25

1 font · 2 req

Heading Font

BridgestoneTypeTP-Regular

Sans

Body Font

BridgestoneTypeTP-Regular

Sans14px

Contrast Ratio

1:1

14 issues

Reading Comfort

~45 CPL

Optimal (45–75)

42px

14px

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

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

⚠️ Partial contrast: 14 elements below WCAG AA threshold (min 1.0:1).

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

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

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFonts

Color Palette

10 unique colors

12.06:1 AAA Light

#eeefef

Background· 21.799999999999997%

#2a2d2d

Text· 18.9%

#060404

Primary· 11.9%

#bcdbea

Accent· 8%

#6e5027

Secondary· 7.2%

#5b4122

Secondary· 7.2%

#5c767e

Secondary· 5.4%

#a88f84

Secondary· 3.8%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)js.ptengine.jp(4)googletagmanager.com(3)cs.nakanohito.jp(1)font.realtype.jp(1)

Website Identity

株式会社ブリヂストン

Organization

ブリヂストンは、世界最大級のタイヤおよびゴム製品を取り扱う会社です。タイヤに加えて、工業用ゴムや化学製品、スポーツ用品などの多様な製品を製造しています。

www.bridgestone.co.jp/

京橋三丁目1番1号, 中央区

104-8340, 中央区, 東京都

日本

Location detected: 🇯🇵 Japan, 中央区via schema_nap

Sponsored

Last analyzed: 28 Apr 2026 at 05:06

Historical Analysis & Change Tracking

bridgestone.co.jp

株式会社ブリヂストン 企業サイト

Accessibility

Carbon Footprint

Mobile Compatibility

Color Palette

株式会社ブリヂストン

株式会社ブリヂストン企業サイト