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surbl.org

https://surbl.org· First analyzed 18 May 2026· Updated 18 May 2026
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surbl.org
Desktop screenshot of surbl.org
Mobile screenshot of surbl.org
Mobile

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Hosting Provider

Hetzner
hetzner.com

IP Address

5.161.67.209

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Ashburn, United States

ASN

AS213230

Organization

Hetzner Online GmbH

Server

Nginx

Nameservers

purple.surbl.org.ns200.surbl.org.green.surbl.org.orange.surbl.org.+2 more

Performance

100

Core Web Vitals

Weight

First Contentful Paint
337 ms10%
Speed Index
438 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
69 KB
14 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Hetzner

Technology Stack

1 Technologies Detected

Web Servers

1
Nginx

SEO Analysis

D44/100
11
11
1
Meta Tags5/15
Content12/12
Headings5/8
Technical7/25
E-E-A-T0/7
Images0/7
Links3/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
S
surbl.orgsurbl.org

SURBL

surbl desc

Title Length5 chars

Recommended: 50-60 chars (~31px / 580px)

Description Length10 chars

Recommended: 120-160 chars

Issues (1)

  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

12 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

111 URLs

robots.txt

Local SEO

Local Search Readiness

3/100
Poor
1 14 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

D43/100
Bot Access
20/25
Machine Read.
17/25
Schema Data
0/25
Citation
6/25

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.txtinvalid
llms-full.txt
Semantic HTML
Heading Hierarchy
blockquotes
Text ratio:55%
Words:747
Token eff.:Optimal
Sections/1K:9.4
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary79w
Descriptive Headingsavg 2.4w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (11)
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.
C
66/100
7
Passed
6
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
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.
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.
76/100
A+
7 mg
CO₂e / view
68.9 KB
Page Weight
95%
Cleaner Than
New Visitor
8 mg
vs
Returning (cached)
4 mg
Annual (10K/mo)
840 g
Emission Segments
Data Center
<0.001 g
Network
2 mg
Device
5 mg
Resource Breakdown
CSS
65.4 KB
HTML
3.5 KB
Green Hosting Verified
Hetzner Online GmbH
GWF Verified
2 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

76%Good
Interactive

HTTPS

No WAF

100d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

21.08.2025

Valid Until

26.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.surbl.orgsurbl.org

SHA-256 Fingerprint

61:D5:45:C5:88:8F:8E:EB:D7:89:3E:CC:56:61:B5:E6:73:43:70:AC...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control
🔴 No Cache(no-store, no-cache, must-revalidate, max-age=60, private, mu...)
content-encoding
📦 Gzip(gzip)
content-security-policy
default-src 'self' http: https: ws: wss: data: blob: 'unsafe...
content-type
text/html; charset=UTF-8
date
Mon, 18 May 2026 21:26:38 GMT
expires
Thu, 19 Nov 1981 08:52:00 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

75

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (3)

vmx03.prolocation.net
vmx02.prolocation.nl
vmx01.prolocation.nl

Domain Information

surbl.org

Domain Age
22y 1m

Created

28.03.2004

Expires

28.03.2030

Last Updated

09.02.2026

Registrar

Gandi SAS

DNSSEC
Not Enabled

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.
F
34/100
Not 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.
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Verdana

WCAG Partial
55/100
Readability
/30
10/30

12px · LH --

Hierarchy
/20
15/20

2.67x ratio

WCAG
/25
16/25

1:1 min contrast

Performance
/25
14/25

1 font

Heading Font

Verdana

Sans32px

Body Font

Verdana

Sans12px

Contrast Ratio

1:1

19 issues

Reading Comfort

~86 CPL

Wide lines
32px
h1
18px
h2
18px
h4
12px
p

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Wide lines: ~86 chars/line. Use max-width: 65ch for comfortable reading.

⚠️ Hard to read: Flesch score 48/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 19 elements below WCAG AA threshold (min 1.0:1).

❌ Broken heading hierarchy: 2 level skip(s). Screen readers rely on sequential headings (h1→h2→h3).

✅ Strong hierarchy: Headlines are 2.7x larger than body text.

Buy on MyFontsFlesch 48

Color Palette

6 unique colors
Light
#ffffff
Text· 50.9%
#879eaf
Primary· 8.6%
#9ab6c7
Secondary· 5.3%
#436581
Secondary· 4.5%

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Scripts & Styles

1 Resources

0
Scripts
1
Styles
0
Async
0
Defer

Top Script Sources

Website Identity

surbl.org

22 years old
Location detected: 🇺🇸 United Statesvia ip
Gandi SAS

Sponsored

Last analyzed: 18 May 2026 at 21:26

Historical Analysis & Change Tracking

surbl.org Technology Stack - Built With Nginx | StackOptic | StackOptic