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kb.nl

https://kb.nl· First analyzed 25 Apr 2026· Updated 25 Apr 2026
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kb.nl
Desktop screenshot of kb.nl
Mobile screenshot of kb.nl
Mobile

Sponsored

Hosting Provider

Konbib

IP Address

195.169.50.5

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇳🇱 Huissen, Netherlands

ASN

AS1103

Organization

Konbib

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns1.zurich.surf.net.ns1.surfnet.nl.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
510 ms10%
Speed Index
663 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.4 MB
38 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Drupal

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

6 Technologies Detected

Analytics

2
Google Analytics
Matomo

Libraries

1
jQuery

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

CDN

1
Cloudflare

SEO Analysis

C68/100
21
7
0
Meta Tags9/15
Content11/12
Headings8/8
Technical19/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
K
kb.nlkb.nl

KB, nationale bibliotheek

Bekijk de digitale, gedrukte en geschreven erfgoedcollecties van Nederland: handschriften, catalogi, boeken, tijdschriften, kranten en kaarten.

Title Length25 chars

Recommended: 50-60 chars (~141px / 580px)

Description Length143 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    1,820 URLs

    robots.txt

    94 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    14/100
    Poor
    4 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

    D44/100
    Bot Access
    20/25
    Machine Read.
    13/25
    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:4%
    Words:824
    Token eff.:Optimal
    Sections/1K:23.1
    Depth:1/5

    Structured Data

    1 JSON-LD

    Citation Readiness

    Opening Summary27w
    Descriptive Headingsavg 3.2w
    Canonical URL
    Open Graph0/3
    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
    88/100
    15
    Passed
    3
    Critical
    0
    Warnings
    Images & Alt Text
    18/20
    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
    9/15
    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.
    50/100
    C
    174 mg
    CO₂e / view
    1.4 MB
    Page Weight
    60%
    Cleaner Than
    New Visitor
    199 mg
    vs
    Returning (cached)
    100 mg
    Annual (10K/mo)
    20.9 kg
    Emission Segments
    Data Center
    39 mg
    Network
    42 mg
    Device
    94 mg
    Resource Breakdown
    JavaScript
    748.7 KB
    Images
    245.5 KB
    CSS
    385.3 KB
    HTML
    27.0 KB
    Other
    3.5 KB
    Green Hosting Not Verified
    Konbib
    5 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A+

    Security Score

    91%Excellent
    Interactive

    HTTPS

    WAF

    229d

    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

    11.12.2025

    Valid Until

    11.12.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (13)

    www.kb.nlpleinplus.kb.nlartikelvinder.kb.nlgeheugen-cms.kb.nlwebstatistiekenwaas.kb.nllab.kb.nlhuisstijlportaal.kb.nlwebwinkel.kb.nl+5 more

    SHA-256 Fingerprint

    A4:AE:8F:FF:81:82:5F:0C:29:17:E8:4C:0A:79:2F:38:08:CC:4C:FD...

    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🔴 No Cache(must-revalidate, no-cache, private)
    cf-cache-status
    DYNAMIC
    cf-ray🇫🇷 Paris
    9f1d798bcd10d50e-CDG
    content-encoding
    ⚡ Brotli(br)
    content-language
    nl
    content-security-policy
    object-src 'none'; script-src 'self' 'unsafe-inline' 'unsafe...
    Good Warning Issue

    Email Infrastructure

    Microsoft 365

    Score

    90

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (1)

    kb-nl.mail.protection.outlook.com

    Domain Information

    kb.nl

    Domain Age
    28y 10m

    Created

    13.06.1997

    Last Updated

    06.03.2026

    Registrar

    SURF B.V.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    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
    72/100
    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

    AGaramondPro-Regular + arial

    WCAG Partial
    83/100
    Readability
    /30
    24/30

    17px · LH 1.50

    Hierarchy
    /20
    20/20

    4.44x ratio · ✓ H1→H6

    WCAG
    /25
    19/25

    1:1 min contrast

    Performance
    /25
    20/25

    System fonts

    Heading Font

    AGaramondPro-Regular

    Sans76px

    Body Font

    arial

    Sans17px

    Contrast Ratio

    1:1

    1 issue

    Reading Comfort

    ~33 CPL

    Narrow lines
    76px
    h1
    76px
    h2
    25px
    h3
    17px
    p

    ✅ Excellent readability: 17px body text is ideal for all devices.

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

    ❌ Very complex text: Flesch score 16/100. Consider shorter sentences and simpler words.

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

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

    ✅ Strong hierarchy: Headlines are 4.4x larger than body text.

    Buy on MyFontsFlesch 16

    Color Palette

    6 unique colors
    2.94:1 Fail Dark
    #2b2b2b
    Other· 57.3%
    #7c6f70
    Other· 6.8%
    #ef6179
    Accent· 18.8%
    #fefdfc
    Primary· 13%
    #bbb2aa
    Secondary· 3.3%
    #8b4f59
    Secondary· 0.7%

    Business & Marketing Stack

    1 Tools Detected

    Growing

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    1

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    15 Resources

    13
    Scripts
    2
    Styles
    4
    Async
    5
    Defer

    Top Script Sources

    local(7)youtube.com(2)webstatistieken.kb.nl(2)analytics.ahrefs.com(1)cdn.jsdelivr.net(1)

    Website Identity

    KB, de nationale bibliotheek

    www.kb.nl/
    28 years old
    Location detected: 🇳🇱 Netherlandsvia tld
    SURF B.V.📧 Microsoft 365nl

    Sponsored

    Last analyzed: 25 Apr 2026 at 12:50

    Historical Analysis & Change Tracking