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jfn.co.jp

https://jfn.co.jp· First analyzed 12 May 2026· Updated 12 May 2026
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jfn.co.jp
Desktop screenshot of jfn.co.jp
Mobile screenshot of jfn.co.jp
Mobile

Sponsored

Hosting Provider

HETEML

IP Address

157.7.44.237

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS7506

Organization

HETEML

Server

Apache

Nameservers

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

Performance

97

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%
5.3 MB
144 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPressv6.1.4
cms
jfnv1.0Custom

Technology Stack

11 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

Plugins

2
Contact Form 7
Cf7 Conditional Fields

Libraries

1
jQueryv3.7.1

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Tag Managers

1
Google Tag Manager

Web Servers

1
Apache

Languages

1
PHPv8.3.31

CDN

1
Cloudflare

SEO Analysis

C65/100
18
6
0
Meta Tags10/15
Content6/12
Headings8/8
Technical17/25
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
J
jfn.co.jpjfn.co.jp

JFN｜ジャパンエフエムネットワーク | JFNは全国で放送するラジオを作っています

JFNは全国で放送するラジオを作っています

Title Length42 chars

Recommended: 50-60 chars (~258px / 580px)

Description Length21 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    8 URLs

    8 sub-sitemaps

    robots.txt

    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

    F38/100
    Bot Access
    20/25
    Machine Read.
    7/25
    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
    nav
    Text ratio:2%
    Words:191
    Token eff.:Too Short
    Sections/1K:261.8
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary
    Descriptive Headingsavg 1.4w
    Canonical URL
    Open Graph3/3
    Twitter Card1/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (9)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    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.
    A
    85/100
    13
    Passed
    2
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    20/20
    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
    11/15
    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.
    1 recommendation
    • •Accessibility recommendation preview...
    Upgrade to view recommendations

    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.
    16/100
    F
    669 mg
    CO₂e / view
    5.3 MB
    Page Weight
    5%
    Cleaner Than
    New Visitor
    764 mg
    vs
    Returning (cached)
    382 mg
    Annual (10K/mo)
    80.2 kg
    Emission Segments
    Data Center
    149 mg
    Network
    161 mg
    Device
    359 mg
    Resource Breakdown
    JavaScript
    108.4 KB
    Images
    5.1 MB
    CSS
    40.0 KB
    HTML
    13.7 KB
    Green Hosting Not Verified
    HETEML
    8 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    71%Good
    Static / Informational

    HTTPS

    No WAF

    14d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    25.02.2026

    Valid Until

    26.05.2026

    Subject Alternative Names (2)

    jfn.co.jpwww.jfn.co.jp

    SHA-256 Fingerprint

    5E:A5:B6:B6:0D:A3:96:20:87:1C:BB:56:CC:7D:EE:DC:9D:E9:10:D4...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    none
    content-encoding
    📦 Gzip(gzip)
    content-length
    13726
    content-type
    text/html; charset=UTF-8
    date
    Tue, 12 May 2026 04:53:57 GMT
    link
    <https://jfn.co.jp/wp-json/>; rel="https://api.w.org/", <htt...
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    95

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (5)

    alt1.aspmx.l.google.com
    alt2.aspmx.l.google.com
    alt3.aspmx.l.google.com
    aspmx.l.google.com

    +1 more

    Domain Information

    jfn.co.jp

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Privacy policy page linked

    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.
    C
    60/100
    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
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    sans-serif

    WCAG Partial
    59/100
    Readability
    /30
    18/30

    14px · LH 1.80

    Hierarchy
    /20
    12/20

    1x ratio · ✓ H1→H6

    WCAG
    /25
    13/25

    1.59:1 min contrast

    Performance
    /25
    16/25

    0 fonts

    Heading Font

    sans-serif

    Sans14px

    Body Font

    sans-serif

    Sans14px

    Contrast Ratio

    1.59:1

    15 issues

    Reading Comfort

    ~47 CPL

    Optimal (45–75)
    14px
    h1
    70px
    h2
    22px
    h3
    14px
    p

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

    ✅ Optimal line length: ~47 chars/line (ideal 45–75 CPL).

    ⚠️ Partial contrast: 15 elements below WCAG AA threshold (min 1.6:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

    ❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

    Color Palette

    10 unique colors
    21:1 AAA Light
    #ffffff
    Background· 66.1%
    #000000
    Text· 9.799999999999999%
    #738b92
    Primary· 4.3%
    #1d111f
    Secondary· 3.8%
    #b39a9b
    Secondary· 3.8%
    #405061
    Secondary· 3.4%
    #bccbd7
    Secondary· 3.3%
    #825c52
    Secondary· 3.2%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    2

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    21 Resources

    17
    Scripts
    4
    Styles
    6
    Async
    0
    Defer

    Top Script Sources

    jfn.co.jp(8)googletagmanager.com(3)px.ladsp.com(1)pixel.byspotify.com(1)cd.ladsp.com(1)

    Website Identity

    jfn.co.jp

    Location detected: 🇯🇵 Japanvia tld
    📧 Google Workspaceja

    Sponsored

    Last analyzed: 12 May 2026 at 04:54

    Historical Analysis & Change Tracking