concertzender.nl

https://concertzender.nl· First analyzed 16 May 2026· Updated 16 May 2026

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concertzender.nl

Mobile

Sponsored

Hosting Provider

Greenhost BV

IP Address

213.108.104.104

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇳🇱 Amsterdam, The Netherlands

ASN

AS47172

Organization

Greenhost BV

Server

Apache

Nameservers

ns3.greenhost.nl.ns1.greenhost.nl.ns2.greenhost.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

596 ms10%

Speed Index

775 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

708 KB

106 requests

Image Optimization

WebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Concertzender Theme Refurbishedv1.0Custom

by methodos

View Theme

Technology Stack

18 Technologies Detected

Plugins

A World Of Jazz Formidable Favourites Page

Polylang

Elasticpress Helper Program Guide Cz Player Elasticpress Powerpress

Analytics

Frameworks

Libraries

CSS Frameworks

Icon Libraries

Tag Managers

Web Servers

SEO Analysis

D59/100

Meta Tags12/15

Content11/12

Headings3/8

Technical13/21

E-E-A-T0/7

Images4/7

Links4/5

URL5/5

Social3/5

Freshness0/4

Mobile1/4

Indexability3/3

concertzender.nlconcertzender.nl

Concertzender | radio, themakanalen, On Demand

De Concertzender is er voor muziekliefhebbers die het avontuur niet schuwen. Onder het motto 'herkennen en verkennen' schotelt de Concertzender de luisteraar...

Description truncated.

Title Length46 chars

Recommended: 50-60 chars (~282px / 580px)

Description Length350 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

10 issues found

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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.

Sponsored

AI & LLM Readiness

F36/100

Bot Access

20/25

Machine Read.

8/25

Schema Data

0/25

Citation

8/25

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:3%

Words:869

Token eff.:Optimal

Sections/1K:3.5

Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary938w

Descriptive Headingsavg 2.4w

Canonical URL

Open Graph3/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

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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.

57/100

Passed

Critical

Warnings

Images & Alt Text

10/20

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

3/15

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

5/15

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

5 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.

68/100

72 mg

CO₂e / view

707.6 KB

Page Weight

80%

Cleaner Than

New Visitor

82 mg

Returning (cached)

41 mg

Annual (10K/mo)

8.6 kg

Emission Segments

Data Center

4 mg

Network

21 mg

Device

47 mg

Resource Breakdown

JavaScript

262.0 KB

Images

334.9 KB

CSS

86.7 KB

HTML

24.1 KB

Green Hosting Verified

Greenhost

GWF Verified

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

38d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (3072 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

26.03.2026

Valid Until

24.06.2026

Subject Alternative Names (1)

www.concertzender.nl

SHA-256 Fingerprint

B0:0E:60:8D:69:97:11:07:1F:4D:46:F7:6F:2E:9E:79:33:85:1B:AD...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟡 1 Hours(max-age=3600)

cf-edge-cache

cache,platform=wordpress

content-encoding

📦 Gzip(gzip)

content-length

24354

content-type

text/html; charset=UTF-8

date

Sat, 16 May 2026 03:35:56 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mx2.greenhost.nl

mx1.greenhost.nl

Domain Information

concertzender.nl

Domain Age

30 years

Created

14.05.1996

Last Updated

31.12.2025

Registrar

Metaregistrar B.V.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

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.

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

1 recommendation

•Mobile compatibility recommendation preview...

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Typography & Readability

MontserratBold + Montserrat

WCAG AA

61/100

Readability

/30

18/30

14px · LH 1.64

Hierarchy

/20

8/20

WCAG

/25

22/25

4.54:1 min contrast

Performance

/25

13/25

2 fonts · 2 req

Heading Font

MontserratBold

Sans

Body Font

Montserrat

Sans14px

Contrast Ratio

4.54:1

WCAG AA (≥4.5:1)

Reading Comfort

Dual Sans-Serif

left aligned

32px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

⚠️ Hard to read: Flesch score 43/100. Simplify sentences for wider reach.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 4.5:1).

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

✅ Lean font stack: 2 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFontsFlesch 43

Color Palette

12 unique colors

18.74:1 AAA Light

#ffffff

Background· 75.89999999999999%

#111214

Secondary· 3.6%

#bdb79e

Primary· 2.9%

#d9dacf

Secondary· 2.8%

#b834a6

Accent· 2.2%

#4b393c

Secondary· 2.2%

#f2ecea

Secondary· 1.7%

#aa719f

Secondary· 1%

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

connect.facebook.net(4)concertzender.nl(3)googletagmanager.com(2)

Website Identity

concertzender.nl

30 years old

Location detected: 🇳🇱 Netherlandsvia tld

Metaregistrar B.V.nl

Sponsored

Last analyzed: 16 May 2026 at 03:36

Historical Analysis & Change Tracking