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knzb.nl

https://knzb.nl· First analyzed 19 May 2026· Updated 19 May 2026
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knzb.nl
Desktop screenshot of knzb.nl
Mobile screenshot of knzb.nl
Mobile

Sponsored

Hosting Provider

Cloudflare
cloudflare.com

IP Address

104.21.62.95

Site Location

🇳🇱 Netherlandsvia phone

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

veda.ns.cloudflare.com.sonny.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
456 ms10%
Speed Index
593 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
413 KB
97 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
SmugMug

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

7 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
Hotjar

CSS Frameworks

1
Tailwind CSS

Fonts

1
Google Fonts

Tag Managers

1
Google Tag Manager

CDN

1
Cloudflare

SEO Analysis

B72/100
22
6
0
Meta Tags5/15
Content10/12
Headings6/8
Technical24/25
E-E-A-T2/7
Images6/7
Links2/5
URL5/5
Social5/5
Freshness0/4
Mobile4/4
Indexability3/3
K
knzb.nlknzb.nl

KNZB | Homepage

Welkom op de website van de KNZB

Title Length15 chars

Recommended: 50-60 chars (~93px / 580px)

Description Length32 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    12 URLs

    12 sub-sitemaps

    robots.txt

    27 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    31/100
    Needs Work
    9 11

    Sponsored

    AI & LLM Readiness

    D51/100
    Bot Access
    15/25
    Machine Read.
    12/25
    Schema Data
    7/25
    Citation
    17/25

    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
    Text ratio:4%
    Words:1,044
    Token eff.:Optimal
    Sections/1K:33.5

    Structured Data

    4 JSON-LD
    Person×1.3(min)Organization×1.1(min)WebSiteBreadcrumbList
    sameAs entity links

    Citation Readiness

    Opening Summary67w
    Descriptive Headingsavg 3.4w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (7)
    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
    12
    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
    9/15
    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.
    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.
    70/100
    A
    42 mg
    CO₂e / view
    412.6 KB
    Page Weight
    90%
    Cleaner Than
    New Visitor
    48 mg
    vs
    Returning (cached)
    24 mg
    Annual (10K/mo)
    5.0 kg
    Emission Segments
    Data Center
    2 mg
    Network
    12 mg
    Device
    27 mg
    Resource Breakdown
    JavaScript
    207.3 KB
    Images
    2.2 KB
    CSS
    180.0 KB
    Fonts
    1.1 KB
    HTML
    21.9 KB
    Green Hosting Verified
    Cloudflare
    GWF Verified
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A+

    Security Score

    93%Excellent
    Static / Informational

    HTTPS

    WAF

    67d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Google Trust Services

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-256

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2+H3

    Valid From

    27.04.2026

    Valid Until

    26.07.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    knzb.nl*.knzb.nl

    SHA-256 Fingerprint

    DA:67:C0:C5:D4:B4:3F:E3:67:B7:6F:FC:08:01:73:8C:98:30:F9:C8...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    age
    1662
    alt-svc
    h3=":443"; ma=86400
    cache-control
    🟡 4 Hours(public, max-age=14400, s-maxage=3600)
    cf-cache-status
    HIT
    cf-ray🇫🇷 Paris
    9fe4ec25b8767034-CDG
    content-encoding
    zstd
    Good Warning Issue

    Email Infrastructure

    Microsoft 365

    Score

    100

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    MX Records (1)

    knzb-nl.mail.protection.outlook.com

    Domain Information

    knzb.nl

    Domain Age
    26y 11m

    Created

    30.06.1999

    Last Updated

    30.12.2025

    Registrar

    BIT B.V.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot
    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
    71/100
    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

    DIN Next + Open Sans

    WCAG Partial
    65/100
    Readability
    /30
    21/30

    16px · LH 1.60

    Hierarchy
    /20
    14/20

    1.75x ratio

    WCAG
    /25
    16/25

    1.36:1 min contrast

    Performance
    /25
    14/25

    3 fonts · 5 req

    Heading Font

    DIN Next

    Sans28px

    Body Font

    Open Sans

    Sans16px

    Contrast Ratio

    1.36:1

    14 issues

    Reading Comfort

    ~39 CPL

    Narrow lines
    28px
    h1
    40px
    h2
    24px
    h3
    22px
    h4
    16px
    p
    Minor Second
    Scale

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

    ✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

    ❌ Very complex text: Flesch score 28/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 14 elements below WCAG AA threshold (min 1.4:1).

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

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

    GGoogle FontsBuy on MyFontsFlesch 28

    Color Palette

    13 unique colors
    Light
    #ffffff
    Primary· 29%
    #a38f82
    Secondary· 8%
    #153579
    Accent· 6.7%
    #395285
    Secondary· 6.7%
    #0a1930
    Accent· 6.6%
    #ac643d
    Secondary· 6.2%
    #5a3637
    Secondary· 6.1%
    #4a7e88
    Secondary· 5.1%

    Business & Marketing Stack

    5 Tools Detected

    Enterprise

    CRM Systems

    1
    Zoho CRMMid-Market

    Customer Relationship Management platforms

    Behavior Analytics

    3
    Google Tag ManagerFree
    Google AnalyticsFree
    HotjarMid-Market

    User behavior and product analytics

    Privacy & Cookies

    1
    CookiebotMid-Market

    Cookie consent and privacy compliance tools

    3

    Categories

    5

    Total Tools

    0

    Enterprise

    3

    Mid-Market

    Assessment: Sophisticated marketing and sales technology infrastructure

    Sponsored

    Scripts & Styles

    12 Resources

    10
    Scripts
    2
    Styles
    6
    Async
    3
    Defer

    Top Script Sources

    consent.cookiebot.com(3)googletagmanager.com(2)consentcdn.cookiebot.com(1)salesiq.zoho.eu(1)static.hotjar.com(1)

    Website Identity

    KNZB

    KNZB

    Corporation

    De KNZB zet zich al 130 jaar in voor de zwemsport in Nederland. Als KNZB brengen wij – samen met partners – plezier, veiligheid en fitheid door zwemmen toegankelijk te maken, een leven lang zwemmen voor iedereen. Het is onze missie om met een actueel zwemaanbod dat past bij elke levensfase, zwemmend

    info@knzb.nl
    +31614459192
    www.knzb.nl/
    26 years old

    Coltbaan 1-19, Nieuwegein

    3439 NG, Nieuwegein, Utrecht

    Nederland

    Location detected: 🇳🇱 Netherlandsvia phone
    BIT B.V.📧 Microsoft 365nl

    Sponsored

    Last analyzed: 19 May 2026 at 17:46

    Historical Analysis & Change Tracking