concertgebouw.nl

https://concertgebouw.nl· First analyzed 28 Apr 2026· Updated 28 Apr 2026

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concertgebouw.nl

Mobile

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Hosting Provider

EXONET-VIRTUALSERVERS

IP Address

178.22.63.31

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇳🇱 Zevenaar, The Netherlands

ASN

AS12859

Server

Nginx

CDN

Nameservers

ns2.dn-s.nl.ns4.dn-s.nl.ns1.dn-s.nl.ns3.dn-s.nl.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

444 ms10%

Speed Index

577 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

933 KB

74 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Nuxt.js

Styling

Tailwind CSS

Infrastructure

Hosting

EXONET-VIRTUALSERVERS

CDN

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

9 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Tag Managers

Other

Web Servers

Security

SEO Analysis

B71/100

Meta Tags14/15

Content3/12

Headings8/8

Technical20/25

E-E-A-T0/7

Images3/7

Links5/5

URL5/5

Social5/5

Freshness2/4

Mobile3/4

Indexability3/3

concertgebouw.nlconcertgebouw.nl

One of the most famous concert halls - Concertgebouw - English

The acoustics of The Concertgebouw are world famous. With 700 concerts a year you can enjoy great classical concerts in Amsterdam. Book online!

Title Length63 chars

Recommended: 50-60 chars (~393px / 580px)

Description Length143 chars

Recommended: 120-160 chars

Issues (1)

• Very thin content (11 words). Search engines need substantial content for ranking.

5 issues found

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Crawlability

Sitemap

Type: index

20 URLs

20 sub-sitemaps

robots.txt

14 rules

Sitemap reference found

Local SEO

Local Search Readiness

13/100

Poor

4 12 2

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

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AI & LLM Readiness

F28/100

Bot Access

20/25

Machine Read.

1/25

Schema Data

0/25

Citation

7/25

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

Text ratio:3%

Words:3,191

Token eff.:Poor Structure

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headings

Canonical URL

Open Graph3/3

Twitter Card3/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

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.

67/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

6/20

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

14/15

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

1/15

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

2 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.

75/100

94 mg

CO₂e / view

932.7 KB

Page Weight

80%

Cleaner Than

New Visitor

108 mg

Returning (cached)

54 mg

Annual (10K/mo)

11.3 kg

Emission Segments

Data Center

5 mg

Network

28 mg

Device

62 mg

Resource Breakdown

JavaScript

656.7 KB

Images

52.9 KB

CSS

144.3 KB

HTML

78.7 KB

Green Hosting Verified

BIT

GWF Verified

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

41%Poor

Interactive

HTTPS

No WAF

44d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

14.03.2026

Valid Until

12.06.2026

Subject Alternative Names (2)

*.concertgebouw.nlconcertgebouw.nl

SHA-256 Fingerprint

62:69:E1:19:E4:0D:DF:A3:40:EC:41:B5:D7:C3:FB:A5:25:F0:4D:DF...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-credentials

true

access-control-allow-origin

https://cms.concertgebouw.nl

age

cache-control

🔵 Public(public, s-maxage=60, stale-while-revalidate=60, stale-if-err...)

content-encoding

📦 Gzip(gzip)

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

concertgebouw-nl.mail.protection.outlook.com

Domain Information

concertgebouw.nl

Domain Age

29y 10m

Created

11.06.1996

Last Updated

05.10.2020

Registrar

team.blue nl B.V.

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Legitimate interest basis 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.

79/100

Mobile Friendly214 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

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

FuturaTL

WCAG Partial

59/100

Readability

/30

17/30

15px · LH 1.60

Hierarchy

/20

12/20

1.07x ratio · ✓ H1→H6

WCAG

/25

17/25

1.1:1 min contrast

Performance

/25

13/25

1 font · 5 req

Heading Font

FuturaTL

Sans16px

Body Font

FuturaTL

Sans15px

Contrast Ratio

1.1:1

10 issues

Reading Comfort

~40 CPL

Narrow lines

16px

36px

30px

24px

15px

Major Second

Scale

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

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

⚠️ Hard to read: Flesch score 33/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 10 elements below WCAG AA threshold (min 1.1:1).

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

⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

Buy on MyFontsFlesch 33

Color Palette

8 unique colors

18.02:1 AAA Light

#ffffff

Primary· 36.099999999999994%

#171619

Text· 7.300000000000001%

#1e313e

Secondary· 12.600000000000001%

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

A/B Testing & Optimization

VWO (Visual Website Optimizer)Mid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

18 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(15)consent.cookiebot.com(2)googletagmanager.com(1)

Website Identity

concertgebouw.nl

29 years old

Location detected: 🇳🇱 Netherlandsvia tld

team.blue nl B.V.📧 Microsoft 365en

Social Profiles

Facebook X (Twitter)Instagram YouTube

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Last analyzed: 28 Apr 2026 at 16:29

Historical Analysis & Change Tracking