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atlas.cern

https://atlas.cern· First analyzed 09 May 2026· Updated 09 May 2026
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atlas.cern
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Hosting Provider

CERN-GPN2

IP Address

188.184.76.146

Site Location

🇨🇭 Switzerlandvia ip

Server Location

🇨🇭 Geneva, Switzerland

ASN

AS513

Server

Nginx

Nameservers

ext-dns-1.cern.ch.ext-dns-2.cern.ch.

Performance

73

Core Web Vitals

Weight

First Contentful Paint
12.2 s10%
Speed Index
15.9 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
9.1 MB
188 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Drupal

Technology Stack

10 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
Matomo

CSS Frameworks

2
Bootstrap
Tailwind CSS

Libraries

1
jQuery

UI Components

1
Owl Carousel

Other

1
ScrollMagic

Social

1
AddThis

Web Servers

1
Nginx

SEO Analysis

C63/100
19
9
0
Meta Tags11/15
Content9/12
Headings6/8
Technical17/25
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social0/5
Freshness2/4
Mobile2/4
Indexability3/3
A
atlas.cernatlas.cern

ATLAS Experiment at CERN | ATLAS Experiment at CERN

Official public website for the ATLAS Experiment at CERN

Title Length51 chars

Recommended: 50-60 chars (~315px / 580px)

Description Length56 chars

Recommended: 120-160 chars

Issues (0)

    9 issues found

    Upgrade to view details

    Crawlability

    Sitemap
    robots.txt

    54 rules

    Local SEO

    Local Search Readiness

    9/100
    Poor
    2 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

    D48/100
    Bot Access
    20/25
    Machine Read.
    13/25
    Schema Data
    0/25
    Citation
    15/25

    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:4%
    Words:311
    Token eff.:Optimal
    Sections/1K:35.4
    Depth:2/5

    Structured Data

    RDFa

    Citation Readiness

    Opening Summary87w
    Descriptive Headingsavg 4.3w
    Canonical URL
    Open Graph0/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (8)
    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
    87/100
    14
    Passed
    2
    Critical
    1
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    18/20
    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
    8/15
    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.
    18/100
    F
    1.16 g
    CO₂e / view
    9.1 MB
    Page Weight
    5%
    Cleaner Than
    New Visitor
    1.32 g
    vs
    Returning (cached)
    660 mg
    Annual (10K/mo)
    138.6 kg
    Emission Segments
    Data Center
    258 mg
    Network
    277 mg
    Device
    620 mg
    Resource Breakdown
    JavaScript
    156.5 KB
    Images
    6.2 MB
    CSS
    2.7 MB
    HTML
    11.2 KB
    Other
    300 B
    Green Hosting Not Verified
    CERN-GPN2
    8 recommendations
    • •Carbon footprint recommendation preview...
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    D

    Security Score

    41%Poor
    Interactive

    HTTPS

    No WAF

    199d

    Certificate Details

    Type

    Organization Validated (OV)

    Certificate Authority

    Sectigo Limited

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/1.1

    Valid From

    05.11.2025

    Valid Until

    24.11.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (20)

    www.cern.ch*.app.cern.ch*.apptest.cern.ch*.docs.cern.ch*.web.cern.ch*.webtest.cern.chabout.cernaccelerating-news.eu+12 more

    SHA-256 Fingerprint

    17:0D:6B:78:94:64:BC:C4:3F:F6:0F:D0:0C:82:5B:26:15:2E:11:60...

    Top Recommendations

    Security recommendation preview

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    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🔴 No Cache(must-revalidate, no-cache, private)
    content-encoding
    📦 Gzip(gzip)
    content-language
    en
    content-type
    text/html; charset=UTF-8
    date
    Sat, 09 May 2026 09:18:01 GMT
    expires
    Sun, 19 Nov 1978 05:00:00 GMT
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    0

    SPF
    DKIM
    DMARC

    Domain Information

    atlas.cern

    Domain Age
    10y 5m

    Created

    03.12.2015

    Expires

    03.12.2026

    Last Updated

    04.12.2025

    Registrar

    CSC Corporate Domains, Inc.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot

    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
    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...
    Upgrade to view recommendations

    Typography & Readability

    opensans-bold + Open Sans

    WCAG Partial
    51/100
    Readability
    /30
    20/30

    16px · LH 1.40

    Hierarchy
    /20
    15/20

    2.25x ratio

    WCAG
    /25
    9/25

    1:1 min contrast

    Performance
    /25
    7/25

    3 fonts · 12 req

    Heading Font

    opensans-bold

    Sans36px

    Body Font

    Open Sans

    Sans16px

    Contrast Ratio

    1:1

    30 issues

    Reading Comfort

    ~41 CPL

    Narrow lines
    36px
    h1
    30px
    h2
    20px
    h3
    18px
    h4
    16px
    p

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

    ✅ Optimal line spacing: 1.40 ratio (ideal range 1.4–1.6).

    ❌ Very complex text: Flesch score 9/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 30 elements below WCAG AA threshold (min 1.0:1).

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

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

    Buy on MyFontsFlesch 9

    Color Palette

    15 unique colors
    2.28:1 Fail Dark
    #424549
    Other· 4.9%
    #737c88
    Secondary· 3.9%
    #0b80c3
    Primary· 13.6%
    #271e1a
    Secondary· 8.4%
    #a38569
    Secondary· 8.3%
    #6b391b
    Accent· 7.5%
    #ead2b7
    Accent· 6.6%
    #fdfaf5
    Primary· 6.5%

    Business & Marketing Stack

    3 Tools Detected

    Advanced

    Behavior Analytics

    2
    Google AnalyticsFree
    Matomo (Piwik)Mid-Market

    User behavior and product analytics

    Social Media

    1
    AddThisFree

    Social widgets and sharing tools

    2

    Categories

    3

    Total Tools

    0

    Enterprise

    1

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Sponsored

    Scripts & Styles

    30 Resources

    20
    Scripts
    10
    Styles
    5
    Async
    1
    Defer

    Top Script Sources

    local(14)googletagmanager.com(3)google-analytics.com(1)webanalytics.web.cern.ch(1)s7.addthis.com(1)

    Website Identity

    atlas.cern

    10 years old
    Location detected: 🇨🇭 Switzerlandvia ip
    CSC Corporate Domains, Inc.en

    Sponsored

    Last analyzed: 09 May 2026 at 12:41

    Historical Analysis & Change Tracking

    atlas.cern Technology Stack - Built With jQuery, Owl Carousel, ScrollMagic, Bootstrap, Tailwind CSS | StackOptic | StackOptic