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ivdnt.org

https://ivdnt.org· First analyzed 05 May 2026· Updated 05 May 2026
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ivdnt.org
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Hosting Provider

Universiteit Leiden

IP Address

132.229.188.232

Site Location

🇳🇱 Netherlandsvia ip

Server Location

🇳🇱 Leiden, Netherlands

ASN

AS1103

Organization

Universiteit Leiden

Server

Apache

Nameservers

ns1.argewebhosting.eu.ns3.argewebhosting.nl.ns2.argewebhosting.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
625 ms10%
Speed Index
812 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.3 MB
40 requests

Image Optimization

Responsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPressv6.9.4
cms
Twenty Twentyv3.0
by the WordPress team
View Theme

Technology Stack

16 Technologies Detected

Plugins

10
TwentigPage ListSearch FilterSimple Social ButtonsVery Simple Event ListInt_Stijl
Ninja Forms Uploads
Int_Json_LijstenMolongui Authorship
Yoast SEO

Libraries

1
jQueryv3.7.1

Other

1
Leaflet

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Email Marketing

1
Mailchimp

Web Servers

1
Apache

SEO Analysis

A85/100
25
6
0
Meta Tags12/15
Content8/12
Headings8/8
Technical24/25
E-E-A-T5/7
Images3/7
Links5/5
URL5/5
Social5/5
Freshness4/4
Mobile3/4
Indexability3/3
I
ivdnt.orgivdnt.org

Instituut voor de Nederlandse Taal

Het Instituut voor de Nederlandse Taal is dé plek voor iedereen die iets wil weten over het Nederlands door de eeuwen heen.

Title Length34 chars

Recommended: 50-60 chars (~202px / 580px)

Description Length123 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    14 URLs

    14 sub-sitemaps

    robots.txt

    3 rules

    Sitemap reference found

    Allows all crawlers

    Local SEO

    Local Search Readiness

    18/100
    Poor
    5 12

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

    Sponsored

    AI & LLM Readiness

    D59/100
    Bot Access
    20/25
    Machine Read.
    13/25
    Schema Data
    8/25
    Citation
    18/25

    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:357
    Token eff.:Optimal
    Sections/1K:33.6
    Depth:1/5

    Structured Data

    4 JSON-LD
    Organization×1.1WebSiteBreadcrumbListSearchAction
    sameAs entity links

    Citation Readiness

    Opening Summary107w
    Descriptive Headingsavg 1.6w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (5)
    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.
    C
    63/100
    12
    Passed
    3
    Critical
    2
    Warnings
    Images & Alt Text
    8/20
    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
    5/15
    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.
    4 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.
    32/100
    C
    161 mg
    CO₂e / view
    1.3 MB
    Page Weight
    70%
    Cleaner Than
    New Visitor
    184 mg
    vs
    Returning (cached)
    92 mg
    Annual (10K/mo)
    19.3 kg
    Emission Segments
    Data Center
    36 mg
    Network
    39 mg
    Device
    87 mg
    Resource Breakdown
    JavaScript
    143.8 KB
    Images
    122.2 KB
    CSS
    917.3 KB
    HTML
    120.2 KB
    Green Hosting Not Verified
    Universiteit Leiden
    5 recommendations
    • •Carbon footprint recommendation preview...
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    C

    Security Score

    66%Fair
    Interactive

    HTTPS

    No WAF

    34d

    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/2

    Valid From

    11.03.2026

    Valid Until

    09.06.2026

    Subject Alternative Names (2)

    ivdnt.orgwww.ivdnt.org

    SHA-256 Fingerprint

    84:7D:40:42:40:2C:82:06:19:94:BE:28:C6:14:53:05:A9:13:F6:C5...

    Top Recommendations

    Security recommendation preview

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    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-methods
    PUT, GET, POST, OPTIONS
    content-type
    text/html; charset=UTF-8
    date
    Tue, 05 May 2026 17:47:44 GMT
    link
    <https://ivdnt.org/>; rel=shortlink
    permissions-policy
    geolocation=(self), microphone=()
    referrer-policy
    same-origin
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    68

    SPF
    DKIM
    DMARC

    DMARC Policy

    Quarantine (Moderate)

    MX Records (1)

    mail.inl.nl

    Domain Information

    ivdnt.org

    Domain Age
    9y 10m

    Created

    14.06.2016

    Expires

    14.06.2026

    Last Updated

    04.11.2025

    Registrar

    Hosting Concepts B.V. d/b/a Registrar.eu

    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.
    B
    79/100
    Mobile Friendly12 breakpoints
    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

    schoolboek

    WCAG Partial
    71/100
    Readability
    /30
    22/30

    18px · LH 1.50

    Hierarchy
    /20
    11/20

    2.44x ratio

    WCAG
    /25
    18/25

    1.18:1 min contrast

    Performance
    /25
    20/25

    2 fonts · 2 req

    Heading Font

    schoolboek

    Sans44px

    Body Font

    schoolboek

    Sans18px

    Contrast Ratio

    1.18:1

    11 issues

    Reading Comfort

    ~33 CPL

    Narrow lines
    44px
    h1
    38px
    h2
    22px
    h3
    18px
    p

    ✅ Excellent readability: 18px body text is ideal for all devices.

    ✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

    ❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 11 elements below WCAG AA threshold (min 1.2:1).

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

    ✅ Strong hierarchy: Headlines are 2.4x larger than body text.

    Buy on MyFontsFluid Type (rem)Flesch 0

    Color Palette

    8 unique colors
    Light
    #ffffff
    Background· 35.400000000000006%
    #fbf063
    Primary· 37.1%
    #ff7f00
    Accent· 9%
    #88c24a
    Secondary· 9%
    #70583a
    Secondary· 5.6%
    #dcd692
    Accent· 1.7%
    #b8964c
    Secondary· 1.6%
    #fbf58a
    Accent· 0.4%

    Business & Marketing Stack

    2 Tools Detected

    Advanced

    Marketing Automation

    1
    MailchimpSMB

    Email marketing and automation platforms

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    2

    Categories

    2

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Sponsored

    Scripts & Styles

    22 Resources

    12
    Scripts
    10
    Styles
    0
    Async
    2
    Defer

    Top Script Sources

    ivdnt.org(9)s3.amazonaws.com(1)statistiek.ivdnt.org(1)unpkg.com(1)

    Website Identity

    Instituut voor de Nederlandse Taal

    Instituut voor de Nederlandse Taal

    Organization

    Het Instituut voor de Nederlandse Taal is dé plek voor iedereen die iets wil weten over het Nederlands door de eeuwen heen.

    ivdnt.org/
    9 years old
    Location detected: 🇳🇱 Netherlandsvia ip
    Hosting Concepts B.V. d/b/a Registrar.eunl-NL

    Sponsored

    Last analyzed: 05 May 2026 at 17:48

    Historical Analysis & Change Tracking