koncon.nl

https://koncon.nl· First analyzed 12 May 2026· Updated 12 May 2026

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koncon.nl

Mobile

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Hosting Provider

Rootnet Managed Servers BIT

IP Address

185.173.21.177

Site Location

🇳🇱 Netherlandsvia phone

Server Location

🇳🇱 Nijmegen, The Netherlands

ASN

AS12859

Server

Nginx

Nameservers

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

Performance

100

Core Web Vitals

Weight

First Contentful Paint

473 ms10%

Speed Index

615 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

715 KB

29 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Rootnet Managed Servers BIT

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

6 Technologies Detected

Analytics

Libraries

CSS Frameworks

Tag Managers

Web Servers

SEO Analysis

B74/100

Meta Tags10/15

Content10/12

Headings3/8

Technical25/25

E-E-A-T2/7

Images1/7

Links2/5

URL5/5

Social5/5

Freshness4/4

Mobile4/4

Indexability3/3

koncon.nlkoncon.nl

Home | Koninklijk Conservatorium Den Haag

Home

Title Length41 chars

Recommended: 50-60 chars (~248px / 580px)

Description Length4 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (13/16) — critical for accessibility and SEO

7 issues found

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Crawlability

Sitemap

Type: index

12 URLs

12 sub-sitemaps

robots.txt

6 rules

Sitemap reference found

Local SEO

Local Search Readiness

51/100

Fair

14 8

Sponsored

AI & LLM Readiness

D49/100

Bot Access

20/25

Machine Read.

10/25

Schema Data

5/25

Citation

14/25

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:5%

Words:454

Token eff.:Optimal

Sections/1K:11

Depth:2/5

Structured Data

4 JSON-LD

Person×1.3(min)Organization×1.1(min)BreadcrumbList

sameAs entity links

Citation Readiness

Opening Summary17w

Descriptive Headingsavg 1.8w

Canonical URL

Open Graph3/3

Twitter Card3/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (8)

AI readiness recommendation preview...

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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.

68/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

13/20

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

1/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

4 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.

63/100

72 mg

CO₂e / view

714.5 KB

Page Weight

80%

Cleaner Than

New Visitor

83 mg

Returning (cached)

41 mg

Annual (10K/mo)

8.7 kg

Emission Segments

Data Center

4 mg

Network

21 mg

Device

47 mg

Resource Breakdown

JavaScript

410.9 KB

Images

89.4 KB

CSS

203.5 KB

HTML

10.7 KB

Green Hosting Verified

Rootnet

GWF Verified

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

51%Poor

Interactive

HTTPS

No WAF

78d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

30.04.2026

Valid Until

29.07.2026

Subject Alternative Names (1)

www.koncon.nl

SHA-256 Fingerprint

67:0D:3A:7A:AA:BF:17:1D:66:20:88:19:C8:74:D4:D6:82:26:F5:67...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, no-store, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Tue, 12 May 2026 14:10:08 GMT

expires

link

<https://www.koncon.nl/>; rel="canonical", <https://www.konc...

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

koncon-nl.o-v1.mx.microsoft

Domain Information

koncon.nl

Domain Age

31y 9m

Created

15.08.1994

Last Updated

31.03.2026

Registrar

SURF B.V.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

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.

56/100

Mobile Friendly

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, minimum-scale=1, maximum-scale=1, user-scalable=0

4 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Marr Sans Cond Web + Marr Sans Web

WCAG Partial

57/100

Readability

/30

22/30

20px · LH 1.40

Hierarchy

/20

7/20

WCAG

/25

15/25

2.24:1 min contrast

Performance

/25

13/25

2 fonts · 4 req

Heading Font

Marr Sans Cond Web

Sans

Body Font

Marr Sans Web

Sans20px

Contrast Ratio

2.24:1

2 issues

Reading Comfort

~40 CPL

Narrow lines

40px

26px

20px

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

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

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

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 2.2:1).

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

❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

Buy on MyFontsFlesch 0

Color Palette

8 unique colors

11.68:1 AAA Light

#d9d9d9

Other· 86.4%

#1f1f1f

Other· 0.6%

#ffffff

Primary· 0%

#ece9e6

Secondary· 0.9%

#e6ba98

Accent· 0.3%

#917767

Secondary· 0.3%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

maps.googleapis.com(3)local(3)googletagmanager.com(2)unpkg.com(1)cdnjs.cloudflare.com(1)

Website Identity

Koninklijk Conservatorium Den Haag

CollegeOrUniversity

De Hogeschool der Kunsten Den Haag is de overkoepelende organisatie van de Koninklijke Academie van Beeldende Kunsten en het Koninklijk Conservatorium.

info@koncon.nl

+31703151515

koncon.nl/

31 years old

Juliana van Stolberglaan 1, Den Haag

2595 CA, Den Haag, Zuid-Holland

Nederland

Location detected: 🇳🇱 Netherlandsvia phone

SURF B.V.nl

Social Profiles

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Last analyzed: 12 May 2026 at 14:10

Historical Analysis & Change Tracking