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surf.nl

https://surf.nl· First analyzed 26 Apr 2026· Updated 26 Apr 2026
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surf.nl
Desktop screenshot of surf.nl
Mobile screenshot of surf.nl
Mobile

Sponsored

Hosting Provider

SURFnet IV

IP Address

192.87.108.15

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇳🇱 Amsterdam, Netherlands

ASN

AS1103

Server

Nginx

Nameservers

ns3.surfnet.nl.ns2.surfnet.nl.ns1.surfnet.nl.ns1.zurich.surf.net.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
727 ms10%
Speed Index
945 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
9.2 MB
44 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
SURFnet IV

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

5 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Analytics

1
Matomo

Other

1
VWO

Web Servers

1
Nginx

SEO Analysis

B77/100
23
5
0
Meta Tags12/15
Content11/12
Headings8/8
Technical19/25
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social5/5
Freshness2/4
Mobile4/4
Indexability3/3
S
surf.nlsurf.nl

SURF is de ict-coöperatie van onderwijs en onderzoek | SURF.nl

Meer dan 100 onderwijs- en onderzoeksinstellingen in Nederland werken in de coöperatie SURF samen om de kansen van digitalisering ten volle benutten. Het doe...

Description truncated.
Title Length62 chars

Recommended: 50-60 chars (~371px / 580px)

Description Length203 chars

Recommended: 120-160 chars

Issues (0)

    5 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    1,264 URLs

    robots.txt

    43 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    15/100
    Poor
    4 12 2

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

    Sponsored

    AI & LLM Readiness

    D46/100
    Bot Access
    20/25
    Machine Read.
    11/25
    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
    nav
    Text ratio:2%
    Words:915
    Token eff.:Optimal
    Sections/1K:4.4
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary445w
    Descriptive Headingsavg 4.9w
    Canonical URL
    Open Graph3/3
    Twitter Card2/3
    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
    81/100
    14
    Passed
    3
    Critical
    1
    Warnings
    Images & Alt Text
    18/20
    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
    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
    12/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    2 recommendations
    • •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.
    25/100
    F
    1.16 g
    CO₂e / view
    9.2 MB
    Page Weight
    5%
    Cleaner Than
    New Visitor
    1.33 g
    vs
    Returning (cached)
    664 mg
    Annual (10K/mo)
    139.4 kg
    Emission Segments
    Data Center
    259 mg
    Network
    279 mg
    Device
    623 mg
    Resource Breakdown
    JavaScript
    188.9 KB
    Images
    422.4 KB
    CSS
    520.0 KB
    HTML
    260.4 KB
    Other
    7.8 MB
    Green Hosting Not Verified
    SURFnet IV
    6 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A

    Security Score

    81%Very Good
    Interactive

    HTTPS

    No WAF

    86d

    Certificate Details

    Type

    Organization Validated (OV)

    Certificate Authority

    Hellenic Academic and Research Institutions CA

    Key Algorithm

    RSA (4096 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    22.07.2025

    Valid Until

    22.07.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (20)

    surfnet.nlwww.surfnet.nlscipr.nlwww.scipr.nledubadges.nlwww.edubadges.nlcybersaveyourself.nlwww.cybersaveyourself.nl+12 more

    SHA-256 Fingerprint

    ED:6E:51:34:1C:D3:0B:DA:DB:3A:C6:E1:27:EE:64:ED:77:92:BA:17...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🟡 1 Hours(max-age=3600, public)
    content-language
    nl
    content-length
    266315
    content-security-policy
    default-src 'self'; script-src 'self' webstats.surf.nl *.mai...
    content-type
    text/html; charset=UTF-8
    date
    Sun, 26 Apr 2026 21:52:48 GMT
    Good Warning Issue

    Email Infrastructure

    Microsoft 365

    Score

    95

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    MX Records (1)

    surf-nl.mail.protection.outlook.com

    Domain Information

    surf.nl

    Domain Age
    29y 2m

    Created

    03.03.1997

    Last Updated

    31.03.2026

    Registrar

    SURF B.V.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Privacy policy page linked
    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.
    B
    70/100
    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

    Nunito + Source Sans Pro

    WCAG Partial
    70/100
    Readability
    /30
    22/30

    20px · LH 1.44

    Hierarchy
    /20
    17/20

    1.8x ratio · ✓ H1→H6

    WCAG
    /25
    17/25

    1:1 min contrast

    Performance
    /25
    14/25

    3 fonts · 6 req

    Heading Font

    Nunito

    Sans36px

    Body Font

    Source Sans Pro

    Sans20px

    Contrast Ratio

    1:1

    2 issues

    Reading Comfort

    ~36 CPL

    Narrow lines
    36px
    h1
    36px
    h2
    30px
    h3
    24px
    h4
    20px
    p

    ✅ Excellent readability: 20px body text is ideal for all devices.

    ✅ Optimal line spacing: 1.44 ratio (ideal range 1.4–1.6).

    ❌ Very complex text: Flesch score 17/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 1.0:1).

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

    ✅ Smart font loading: font-display: swap prevents invisible text during load (FOIT).

    Buy on MyFontsFlesch 17

    Color Palette

    11 unique colors
    17.71:1 AAA Light
    #ffffff
    Background· 59.99999999999999%
    #191819
    Text· 6.5%
    #a798b7
    Primary· 8.2%
    #824079
    Secondary· 4.6%
    #6a2968
    Secondary· 3.8%
    #8b6388
    Secondary· 2%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    A/B Testing & Optimization

    1
    VWO (Visual Website Optimizer)Mid-Market

    Experimentation and conversion optimization

    2

    Categories

    2

    Total Tools

    0

    Enterprise

    1

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    14 Resources

    11
    Scripts
    3
    Styles
    2
    Async
    1
    Defer

    Top Script Sources

    local(7)surfnl.containers.piwik.pro(2)m17.mailplus.nl(1)static.mailplus.nl(1)

    Website Identity

    surf.nl

    29 years old
    Location detected: 🇳🇱 Netherlandsvia tld
    SURF B.V.📧 Microsoft 365nl

    Social Profiles

    LinkedInYouTubeBluesky

    Sponsored

    Last analyzed: 26 Apr 2026 at 21:53

    Historical Analysis & Change Tracking