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nuon.nl

https://nuon.nl· First analyzed 20 May 2026· Updated 20 May 2026
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nuon.nl
Desktop screenshot of nuon.nl
Mobile screenshot of nuon.nl
Mobile

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Hosting Provider

IP Address

91.192.14.204

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇩🇪 Berlin, Germany

ASN

AS42274

Organization

Vattenfall Europe Information Services GmbH

CDN

CDN

Nameservers

ns1.vattenfall.se.ns2.ndc.nuon.com.ns2.vattenfall.se.ns1.ndc.nuon.com.+2 more

Performance

99

Core Web Vitals

Weight

First Contentful Paint
720 ms10%
Speed Index
936 ms10%
Largest Contentful Paint
25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
3.6 MB
122 requests

Image Optimization

Responsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Ghost

Technology Stack

7 Technologies Detected

SEO Analysis

C69/100
20
3
2
Meta Tags9/15
Content3/12
Headings6/8
Technical23/25
E-E-A-T2/7
Images4/7
Links5/5
URL5/5
Social5/5
Freshness0/4
Mobile4/4
Indexability3/3
N
nuon.nlnuon.nl

Energieleverancier Vattenfall – energie voor zo'n 2 miljoen klanten...

Energieleverancier Vattenfall levert energie aan zo'n 2 miljoen klanten in Nederland. Op deze manier streven we ernaar onze klimaatambitie te behalen.

Title truncated.
Title Length81 chars

Recommended: 50-60 chars (~476px / 580px)

Description Length150 chars

Recommended: 120-160 chars

Issues (2)

  • Title is too long (81 chars, ~476px). Will be truncated in search results.
  • Very thin content (11 words). Search engines need substantial content for ranking.

Crawlability

Sitemap

Type: standard

1,006 URLs

robots.txt

4 rules

Sitemap reference found

Local SEO

Local Search Readiness

23/100
Needs Work
6 14

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AI & LLM Readiness

F37/100
Bot Access
20/25
Machine Read.
7/25
Schema Data
3/25
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:1%
Words:1,131
Token eff.:Optimal

Structured Data

1 JSON-LD
Organization×1.1
sameAs entity links

Citation Readiness

Opening Summary
Descriptive Headings
Canonical URL
Open Graph2/3
Twitter Card3/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (11)
AI readiness recommendation preview...

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.
C
68/100
10
Passed
4
Critical
0
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
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
1/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 recommendations
  • Accessibility recommendation preview...

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.
8/100
F
460 mg
CO₂e / view
3.6 MB
Page Weight
15%
Cleaner Than
New Visitor
525 mg
vs
Returning (cached)
263 mg
Annual (10K/mo)
55.1 kg
Emission Segments
Data Center
103 mg
Network
110 mg
Device
247 mg
Resource Breakdown
JavaScript
41.3 KB
Images
2.6 MB
CSS
932.3 KB
HTML
56.4 KB
Green Hosting Not Verified
Vattenfall Europe Information Services GmbH
7 recommendations
  • Carbon footprint recommendation preview...
C

Security Score

61%Fair
Interactive

HTTPS

No WAF

177d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

13.05.2026

Valid Until

13.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.vattenfall.nl

SHA-256 Fingerprint

77:87:FE:D6:12:34:AB:E5:49:0F:74:7E:02:EE:B2:26:D6:4F:40:0D...

Top Recommendations

Security recommendation preview

HTTP Headers

Developer Console

content-security-policy-report-only
default-src 'self' https://*.svc.dynamics.com https://*.mkt....
content-type
text/html; charset=utf-8
date
Wed, 20 May 2026 02:32:47 GMT
referrer-policy
no-referrer
request-context
appId=cid-v1:583018e0-6761-4d16-878d-d1cd46aaabf2
strict-transport-security
max-age=31536000
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

75

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

mx04.totaal.net

Domain Information

nuon.nl

Domain Age
29y 9m

Created

13.08.1996

Last Updated

04.02.2026

Registrar

Ascio Technologies Inc

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
Privacy policy page linked
Data Protection Officer 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.
C
67/100
Mobile Friendly49 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, shrink-to-fit=no
2 recommendations
  • Mobile compatibility recommendation preview...

Typography & Readability

Vattenfall Hall Display + Vattenfall Hall

WCAG AA
72/100
Readability
/30
20/30

16px · LH 1.70

Hierarchy
/20
15/20

2.75x ratio

WCAG
/25
22/25

5.13:1 min contrast

Performance
/25
15/25

2 fonts · 2 req

Heading Font

Vattenfall Hall Display

Sans44px

Body Font

Vattenfall Hall

Sans16px

Contrast Ratio

5.13:1

WCAG AA (≥4.5:1)

Reading Comfort

~36 CPL

Narrow lines
44px
h1
56px
h2
32px
h3
16px
p

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

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 5.1:1).

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

✅ Strong hierarchy: Headlines are 2.8x larger than body text.

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

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

Color Palette

9 unique colors
3.63:1 AA Large Light
#ffffff
Background· 17.7%
#8a8588
Other· 8.9%
#1e314f
Secondary· 28.8%
#2172b6
Primary· 9.3%
#cbbfb8
Secondary· 4.7%
#354964
Secondary· 3.2%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

1

User behavior and product analytics

A/B Testing & Optimization

1

Experimentation and conversion optimization

2

Categories

2

Total Tools

0

Enterprise

1

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

23 Resources

19
Scripts
4
Styles
3
Async
1
Defer

Top Script Sources

local(9)cdn.vattenfall.nl(4)tdn.r42tag.com(2)dev.visualwebsiteoptimizer.com(1)js.monitor.azure.com(1)

Website Identity

Vattenfall

Vattenfall

Organization

Vattenfall Nederland, tot 2019 bekend als Nuon, is één van de grootste energieleveranciers van Nederland.

www.vattenfall.nl
29 years old

Postbus 40021, Arnhem

6803 HA, Arnhem

Location detected: 🇳🇱 Netherlandsvia tld
Ascio Technologies Incnl

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Last analyzed: 20 May 2026 at 02:33

Historical Analysis & Change Tracking