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uboat.net

https://uboat.net· First analyzed 29 Apr 2026· Updated 29 Apr 2026
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uboat.net
Desktop screenshot of uboat.net
Mobile screenshot of uboat.net
Mobile

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Hosting Provider

Linode (Akamai)
linode.com

IP Address

173.230.138.61

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Atlanta, United States

ASN

AS63949

Organization

Linode

Server

Nginx

Nameservers

ns3.linode.com.ns5.linode.com.ns2.linode.com.ns1.linode.com.+1 more

Performance

100

Core Web Vitals

Weight

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

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Linode (Akamai)

Technology Stack

7 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

Advertising

2
Google AdsGoogle AdSense

CSS Frameworks

1
Tailwind CSS

Fonts

1
Google Fonts

Web Servers

1
Nginx

SEO Analysis

D52/100
15
9
2
Meta Tags8/15
Content10/12
Headings5/8
Technical13/25
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile2/4
Indexability3/3
U
uboat.netuboat.net

The U-boat Wars 1939-1945 (Kriegsmarine) and 1914-1918 (Kaiserliche...

The U-boat War in World War Two (1939-1945) and World War One (1914-1918). Over 30,000 pages on the officers, the boats, technology and the Allied efforts to...

Title truncated. Description truncated.
Title Length115 chars

Recommended: 50-60 chars (~688px / 580px)

Description Length184 chars

Recommended: 120-160 chars

Issues (2)

  • • Title is too long (115 chars, ~688px). Will be truncated in search results.
  • • Most images missing alt text (7/10) — critical for accessibility and SEO

11 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

32 rules

Allows all crawlers

Local SEO

Local Search Readiness

6/100
Poor
2 13 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

F29/100
Bot Access
12/25
Machine Read.
8/25
Schema Data
0/25
Citation
9/25

AI Bot Access

6/14 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:697
Token eff.:Optimal
Sections/1K:7.2

Structured Data

No Schema

Citation Readiness

Opening Summary15w
Descriptive Headingsavg 3w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (12)
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.
C
66/100
10
Passed
5
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
7/15
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
7/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
6/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 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.
52/100
A
46 mg
CO₂e / view
451.6 KB
Page Weight
90%
Cleaner Than
New Visitor
52 mg
vs
Returning (cached)
26 mg
Annual (10K/mo)
5.5 kg
Emission Segments
Data Center
2 mg
Network
13 mg
Device
30 mg
Resource Breakdown
JavaScript
320.9 KB
Images
42.6 KB
CSS
46.1 KB
Fonts
3.9 KB
HTML
14.9 KB
Other
23.3 KB
Green Hosting Verified
Linode (Akamai)
Provider Match
5 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

21%Critical
Interactive

HTTPS

No WAF

37d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

08.03.2026

Valid Until

06.06.2026

Subject Alternative Names (2)

uboat.netwww.uboat.net

SHA-256 Fingerprint

98:34:4E:28:8D:01:6C:91:DF:D9:B8:E3:08:E6:70:10:01:31:B1:77...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

content-type
text/html; charset=UTF-8
date
Wed, 29 Apr 2026 20:46:31 GMT
server
nginx
Good Warning Issue

Email Infrastructure

Google Workspace

Score

95

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

ASPMX2.GOOGLEMAIL.COM
ASPMX.L.GOOGLE.COM
ALT1.ASPMX.L.GOOGLE.COM
ASPMX3.GOOGLEMAIL.COM

+1 more

Domain Information

uboat.net

Domain Age
29y 1m

Created

27.03.1997

Expires

28.03.2028

Last Updated

22.01.2025

Registrar

Network Solutions, LLC

DNSSEC
Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner
Quantcast Choice
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: Quantcast Choice

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.
D
51/100
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
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Verdana

WCAG Partial
48/100
Readability
/30
13/30

13px · LH 1.60

Hierarchy
/20
8/20

1.41x ratio

WCAG
/25
14/25

4.11:1 min contrast

Performance
/25
13/25

1 font · 2 req

Heading Font

Verdana

Sans18px

Body Font

Verdana

Sans13px

Contrast Ratio

4.11:1

4 issues

Reading Comfort

~110 CPL

Too wide
18px
h1
15px
h3
12px
h4
13px
p

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

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

❌ Very long lines: ~110 chars/line causes eye strain. Add max-width constraint.

⚠️ Partial contrast: 4 elements below WCAG AA threshold (min 4.1:1).

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

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

GGoogle FontsBuy on MyFontsFlesch 56

Color Palette

9 unique colors
6.61:1 AA Light
#ffffff
Background· 71.60000000000002%
#5a5d62
Other· 2.6%
#7591ad
Primary· 4%
#d2bdbd
Secondary· 1.4%

Business & Marketing Stack

2 Tools Detected

Advanced

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

Advertising

1
Google AdsEnterprise

Ad platforms and retargeting pixels

2

Categories

2

Total Tools

1

Enterprise

0

Mid-Market

Assessment: Well-developed marketing technology stack

Ad Networks

Google AdSense

Sponsored

Scripts & Styles

12 Resources

8
Scripts
4
Styles
7
Async
0
Defer

Top Script Sources

fundingchoicesmessages.google.com(4)pagead2.googlesyndication.com(3)googletagmanager.com(1)

Website Identity

uboat.net

29 years old
Location detected: 🇺🇸 United Statesvia ip
Network Solutions, LLC📧 Google Workspaceen

Social Profiles

X (Twitter)

Sponsored

Last analyzed: 29 Apr 2026 at 20:46

Historical Analysis & Change Tracking