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deltion.nl

https://deltion.nl· First analyzed 17 May 2026· Updated 17 May 2026
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deltion.nl
Desktop screenshot of deltion.nl
Mobile screenshot of deltion.nl
Mobile

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Hosting Provider

Microsoft Azure
azure.microsoft.com

IP Address

104.40.215.219

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇳🇱 Amsterdam, Netherlands

ASN

AS8075

Organization

Microsoft Azure App Service (westeurope)

CDN

CDN

Nameservers

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

Performance

100

Core Web Vitals

Weight

First Contentful Paint
464 ms10%
Speed Index
603 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
793 KB
49 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Microsoft Azure
CDN
CDN

Technology Stack

4 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Fonts

1
Google Fonts

Analytics

1
Matomo

SEO Analysis

C67/100
19
7
1
Meta Tags13/15
Content10/12
Headings8/8
Technical14/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social3/5
Freshness0/4
Mobile4/4
Indexability3/3
D
deltion.nldeltion.nl

Deltion College - Ontdek wat jij kan | mbo opleidingen in Zwolle

Dé onderwijsinstelling voor jongeren, volwassenen en bedrijven. Bekijk ons uitgebreide aanbod mbo-opleidingen, cursussen, trainingen en voortgezet algemeen v...

Description truncated.
Title Length64 chars

Recommended: 50-60 chars (~381px / 580px)

Description Length183 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (25/32) — critical for accessibility and SEO

8 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1,239 URLs

robots.txt

64 rules

Local SEO

Local Search Readiness

15/100
Poor
5 10 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
nav
Text ratio:4%
Words:2,283
Token eff.:Optimal
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary
Descriptive Headings
Canonical URL
Open Graph3/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (11)
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.
B
70/100
10
Passed
4
Critical
2
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
11/20
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
5/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
4 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.
63/100
B
80 mg
CO₂e / view
793.3 KB
Page Weight
80%
Cleaner Than
New Visitor
92 mg
vs
Returning (cached)
46 mg
Annual (10K/mo)
9.6 kg
Emission Segments
Data Center
4 mg
Network
24 mg
Device
53 mg
Resource Breakdown
JavaScript
168.7 KB
Images
396.5 KB
CSS
165.5 KB
Fonts
1.8 KB
HTML
60.8 KB
Green Hosting Verified
Microsoft Azure
Provider Match
3 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A

Security Score

81%Very Good
Interactive

HTTPS

No WAF

195d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

28.11.2025

Valid Until

28.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (9)

deltion.nlwww.deltion.nlcms.deltion.nlontdekdeltion.nlwww.ontdekdeltion.nlomscholen.infowww.omscholen.infowerkenbijdeltion.nl+1 more

SHA-256 Fingerprint

60:71:58:B4:5F:F3:F0:DE:A5:1B:3E:E7:77:A9:3B:C1:2F:F2:6F:01...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges
bytes
cache-control
🔴 No Cache(private,no-cache, no-store, must-revalidate, pre-check=0, po...)
content-encoding
📦 Gzip(gzip)
content-length
61969
content-security-policy
connect-src 'self' https://dc.services.visualstudio.com htt...
content-type
text/html; charset=utf-8
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

100

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

deltion-nl.e-v1.mx.microsoft

Domain Information

deltion.nl

Domain Age
28y 9m

Created

26.08.1997

Last Updated

31.03.2026

Registrar

SURF B.V.

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

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.
C
64/100
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
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

BuenosAiresWeb

WCAG Partial
78/100
Readability
/30
24/30

16px · LH 1.50

Hierarchy
/20
20/20

4.06x ratio · ✓ H1→H6

WCAG
/25
16/25

1:1 min contrast

Performance
/25
18/25

1 font · 5 req

Heading Font

BuenosAiresWeb

Sans65px

Body Font

BuenosAiresWeb

Sans16px

Contrast Ratio

1:1

2 issues

Reading Comfort

Single Font Family

left aligned
65px
h1
35px
h2
35px
h3
32px
h4
16px
p

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

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

⚠️ Hard to read: Flesch score 42/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 1.0:1).

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

✅ Strong hierarchy: Headlines are 4.1x larger than body text.

GGoogle FontsBuy on MyFontsFlesch 42

Color Palette

12 unique colors
2.53:1 Fail Light
#92867d
Secondary· 5.9%
#dadad8
Other· 5.6%
#f5f5f7
Primary· 26.3%
#6b543f
Secondary· 13%
#3d2d2f
Secondary· 9.2%
#735e54
Secondary· 8.2%
#3c3754
Secondary· 7.8%
#130d0d
Secondary· 6.2%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

11 Resources

9
Scripts
2
Styles
3
Async
4
Defer

Top Script Sources

d886a087-cc99-e111-b9e6-18a905732a2b-01.emea-weu.anywhere365.cloud(3)local(3)deltion.containers.piwik.pro(2)cdn-4.convertexperiments.com(1)

Website Identity

deltion.nl

ssc@deltion.nl
038 850 30 00
28 years old
Location detected: 🇳🇱 Netherlandsvia tld
SURF B.V.nl

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Last analyzed: 17 May 2026 at 03:56

Historical Analysis & Change Tracking