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jlab.org

https://jlab.org· First analyzed 27 Apr 2026· Updated 27 Apr 2026
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jlab.org
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Mobile

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Hosting Provider

Esnet

IP Address

129.57.64.33

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Newport News, United States

ASN

AS6406

Organization

Esnet

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns.jlab.org.adns1.es.net.adns2.es.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
392 ms10%
Speed Index
510 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
53 KB
89 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Drupal

Technology Stack

9 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
Facebook Pixel

CSS Frameworks

2
Bootstrap
Tailwind CSS

Libraries

1
jQuery

UI Components

1
Owl Carousel

Icon Libraries

1
Font Awesome

CDN

1
Cloudflare

SEO Analysis

B71/100
22
7
0
Meta Tags9/15
Content11/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images5/7
Links5/5
URL5/5
Social3/5
Freshness2/4
Mobile2/4
Indexability3/3
J
jlab.orgjlab.org

Home | Jefferson Lab

Jefferson Lab is located in Newport News, Virginia. It is dedicated to researching nuclear physics, materials science, and accelerator science.

Title Length20 chars

Recommended: 50-60 chars (~124px / 580px)

Description Length143 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    7 URLs

    7 sub-sitemaps

    robots.txt

    74 rules

    Local SEO

    Local Search Readiness

    10/100
    Poor
    3 13 1

    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
    15/25
    Machine Read.
    12/25
    Schema Data
    0/25
    Citation
    16/25

    AI Bot Access

    6/14 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
    blockquotesnavheader/footer
    Text ratio:8%
    Words:528
    Token eff.:Optimal
    Sections/1K:49.2
    Depth:3/5

    Structured Data

    1 JSON-LD

    Citation Readiness

    Opening Summary14w
    Descriptive Headingsavg 4.4w
    Canonical URL
    Open Graph3/3
    Twitter Card0/3
    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
    89/100
    14
    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
    17/20
    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
    13/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    9/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

    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.
    64/100
    A+
    7 mg
    CO₂e / view
    53.3 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    8 mg
    vs
    Returning (cached)
    4 mg
    Annual (10K/mo)
    792 g
    Emission Segments
    Data Center
    2 mg
    Network
    2 mg
    Device
    4 mg
    Resource Breakdown
    Images
    43.0 KB
    HTML
    10.3 KB
    Green Hosting Not Verified
    Esnet
    2 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A+

    Security Score

    91%Excellent
    Static / Informational

    HTTPS

    WAF

    78d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-384

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/1.1

    Valid From

    16.04.2026

    Valid Until

    15.07.2026

    Subject Alternative Names (1)

    www.jlab.org

    SHA-256 Fingerprint

    A8:03:51:77:7A:29:59:BF:FF:B8:21:C0:E4:FE:63:68:1E:8C:10:7A...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cf-ray🇮🇹 Milan
    9f2f7fd539b7bd8f-MXP
    cache-control
    🟡 600s(max-age=600, public)
    connection
    keep-alive
    content-encoding
    📦 Gzip(gzip)
    content-type
    text/html; charset=UTF-8
    content-language
    en
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    93

    SPF
    DKIM
    DMARC

    DMARC Policy

    Quarantine (Moderate)

    MX Records (2)

    mxb-0027ee01.gslb.pphosted.com
    mxa-0027ee01.gslb.pphosted.com

    Domain Information

    jlab.org

    Domain Age
    29y 10m

    Created

    22.06.1996

    Expires

    21.06.2026

    Last Updated

    06.05.2025

    Registrar

    GoDaddy.com, LLC

    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.
    D
    57/100
    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
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    avenir-light

    WCAG AA
    71/100
    Readability
    /30
    22/30

    16px · LH 1.43

    Hierarchy
    /20
    12/20

    2.25x ratio

    WCAG
    /25
    22/25

    6.35:1 min contrast

    Performance
    /25
    15/25

    2 fonts · 3 req

    Heading Font

    avenir-light

    Sans36px

    Body Font

    avenir-light

    Sans16px

    Contrast Ratio

    6.35:1

    WCAG AA (≥4.5:1)

    Reading Comfort

    ~34 CPL

    Narrow lines
    36px
    h1
    44px
    h2
    24px
    h3
    16px
    p

    ✅ Excellent readability: 16px body text is ideal for all devices.

    ✅ Optimal line spacing: 1.43 ratio (ideal range 1.4–1.6).

    ❌ Very complex text: Flesch score 11/100. Consider shorter sentences and simpler words.

    ✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 6.3:1).

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

    ✅ Strong hierarchy: Headlines are 2.2x larger than body text.

    Buy on MyFontsFlesch 11

    Color Palette

    8 unique colors
    6.29:1 AA Light
    #ffffff
    Background· 46.6%
    #5a6167
    Other· 11.7%
    #9d838c
    Primary· 5.4%
    #191e23
    Secondary· 4.4%
    #694c54
    Secondary· 2.3%

    Business & Marketing Stack

    3 Tools Detected

    Advanced

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    Advertising

    1
    Facebook PixelMid-Market

    Ad platforms and retargeting pixels

    Social Media

    1
    Facebook SDKFree

    Social widgets and sharing tools

    3

    Categories

    3

    Total Tools

    0

    Enterprise

    1

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Sponsored

    Scripts & Styles

    30 Resources

    20
    Scripts
    10
    Styles
    2
    Async
    1
    Defer

    Top Script Sources

    local(18)googletagmanager.com(1)connect.facebook.net(1)

    Website Identity

    Thomas Jefferson National Accelerator Facility (Jefferson Lab)

    www.jlab.org/
    29 years old
    Location detected: 🇺🇸 United Statesvia ip
    GoDaddy.com, LLCen

    Sponsored

    Last analyzed: 27 Apr 2026 at 17:21

    Historical Analysis & Change Tracking

    jlab.org Technology Stack - Built With jQuery, Owl Carousel, Bootstrap, Tailwind CSS, Font Awesome | StackOptic | StackOptic