bn.org.pl

https://bn.org.pl· First analyzed 28 Apr 2026· Updated 28 Apr 2026

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bn.org.pl

Mobile

Sponsored

Hosting Provider

Biblioteka Narodowa

IP Address

91.238.85.39

Site Location

🇵🇱 Polandvia tld

Server Location

🇵🇱 Warsaw, Poland

ASN

AS203422

Organization

Biblioteka Narodowa

Server

Apache

Nameservers

kirdan.nask.net.pl.dns.bn.org.pl.ns03.telnaptelecom.pl.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

660 ms10%

Speed Index

858 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

2.5 MB

29 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Biblioteka Narodowa

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

9 Technologies Detected

CSS Frameworks

Analytics

Libraries

UI Components

Fonts

Web Servers

Customer Support

SEO Analysis

C64/100

Meta Tags9/15

Content12/12

Headings8/8

Technical13/25

E-E-A-T3/7

Images2/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

bn.org.plbn.org.pl

Biblioteka Narodowa

Witryna Biblioteki Narodowej oferuje dostęp do informacji o wydarzeniach, projektach, szkoleniach, a także do zasobów POLONY, katalogów BN i księgarni BN

Title Length19 chars

Recommended: 50-60 chars (~114px / 580px)

Description Length153 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (4/4) — critical for accessibility and SEO

8 issues found

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Crawlability

Sitemap

robots.txt

10 rules

Local SEO

Local Search Readiness

16/100

Poor

5 10 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

D44/100

Bot Access

20/25

Machine Read.

14/25

Schema Data

0/25

Citation

10/25

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

data-nosnippet

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

header/footer

Text ratio:15%

Words:1,323

Token eff.:Optimal

Sections/1K:37.8

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary67w

Descriptive Headingsavg 3.7w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (8)

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.

A+

90/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

20/20

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

11/15

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

1 recommendation

•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.

23/100

315 mg

CO₂e / view

2.5 MB

Page Weight

30%

Cleaner Than

New Visitor

360 mg

Returning (cached)

180 mg

Annual (10K/mo)

37.8 kg

Emission Segments

Data Center

70 mg

Network

76 mg

Device

169 mg

Resource Breakdown

JavaScript

50.3 KB

Images

2.2 MB

CSS

194.3 KB

Fonts

2.2 KB

HTML

13.9 KB

Green Hosting Not Verified

Biblioteka Narodowa

7 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

90d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Unizeto Technologies S.A.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

28.07.2025

Valid Until

28.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.bn.org.plbn.org.pl

SHA-256 Fingerprint

F1:8C:DF:DF:6C:27:FC:6D:3D:BF:82:20:FE:8F:6E:2E:3D:67:A9:43...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

13888

content-type

text/html; charset=UTF-8

date

Tue, 28 Apr 2026 19:06:00 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

bn-org-pl.mail.protection.outlook.com

Domain Information

bn.org.pl

Domain Age

30y 4m

Created

18.12.1995

Expires

31.12.2026

Last Updated

22.12.2025

Registrar

home.pl sp. z o.o.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

69/100

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

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Roboto

WCAG Partial

60/100

Readability

/30

21/30

16px · LH 1.50

Hierarchy

/20

17/20

2.54x ratio · ✓ H1→H6

WCAG

/25

13/25

3.34:1 min contrast

Performance

/25

9/25

3 fonts · 5 req

Heading Font

Roboto

Sans40px

Body Font

Roboto

Sans16px

Contrast Ratio

3.34:1

25 issues

Reading Comfort

~44 CPL

Narrow lines

40px

32px

28px

11px

16px

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

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

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 25 elements below WCAG AA threshold (min 3.3:1).

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

✅ Strong hierarchy: Headlines are 2.5x larger than body text.

GGoogle FontsFlesch 0

Color Palette

8 unique colors

3.55:1 AA Large Light

#ebebe9

Background· 52.00000000000001%

#797a89

Other· 3.1%

#433f75

Secondary· 8.1%

#d3000f

Primary· 6%

#b99ca9

Secondary· 4%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.jsdelivr.net(4)googletagmanager.com(1)code.jquery.com(1)cdnjs.cloudflare.com(1)local(1)

Website Identity

bn.org.pl

30 years old

Location detected: 🇵🇱 Polandvia tld

home.pl sp. z o.o.📧 Microsoft 365pl

Social Profiles

Facebook X (Twitter)Instagram YouTube

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Last analyzed: 28 Apr 2026 at 19:06

Historical Analysis & Change Tracking