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subnet-calculator.com

https://subnet-calculator.com· First analyzed 20 May 2026· Updated 20 May 2026
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subnet-calculator.com
Desktop screenshot of subnet-calculator.com
Mobile screenshot of subnet-calculator.com
Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)
aws.amazon.com

IP Address

52.57.221.121

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS16509

Organization

AWS EC2 (eu-central-1)

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

seahorse.ezoicns.com.stingray.ezoicns.com.havanese.ezoicns.com.scorpion.ezoicns.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
422 ms10%
Speed Index
549 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
539 KB
250 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Amazon Web Services (AWS)
CDN
Cloudflare

Technology Stack

8 Technologies Detected

Advertising

3
Google AdsGoogle AdSenseCriteo

Analytics

2
Google Analytics
Segment

CSS Frameworks

1
Tailwind CSS

Fonts

1
Google Fonts

CDN

1
Cloudflare

SEO Analysis

C65/100
19
8
0
Meta Tags14/15
Content6/12
Headings8/8
Technical19/25
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile2/4
Indexability3/3
S
subnet-calculator.comsubnet-calculator.com

Online IP Subnet Calculator and CIDR Calculator

The original fully featured, professional IPv4 network calculators including classful subnet, CIDR and wildcard mask calculators

Title Length47 chars

Recommended: 50-60 chars (~276px / 580px)

Description Length128 chars

Recommended: 120-160 chars

Issues (0)

    8 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    5 URLs

    robots.txt

    3 rules

    Local SEO

    Local Search Readiness

    7/100
    Poor
    2 14 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.
    7/25
    Schema Data
    0/25
    Citation
    9/25

    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:461
    Token eff.:Optimal

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary30w
    Descriptive Headingsavg 2.3w
    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
    64/100
    11
    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
    14/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    2/15
    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.
    66/100
    A
    54 mg
    CO₂e / view
    539.0 KB
    Page Weight
    80%
    Cleaner Than
    New Visitor
    62 mg
    vs
    Returning (cached)
    31 mg
    Annual (10K/mo)
    6.5 kg
    Emission Segments
    Data Center
    3 mg
    Network
    16 mg
    Device
    36 mg
    Resource Breakdown
    JavaScript
    428.1 KB
    Images
    13.7 KB
    CSS
    2.2 KB
    Fonts
    10.2 KB
    HTML
    9.5 KB
    Other
    75.2 KB
    Green Hosting Verified
    Amazon Web Services (AWS)
    Provider Match
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    26%Critical
    Interactive

    HTTPS

    WAF

    36d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Google Trust Services

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-256

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2+H3

    Valid From

    28.03.2026

    Valid Until

    26.06.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (1)

    www.subnet-calculator.com

    SHA-256 Fingerprint

    B4:FF:0A:72:AB:18:8C:A8:20:44:EE:64:D9:07:78:9B:20:58:6F:76...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    alt-svc
    h3=":443"; ma=86400
    cache-control
    🔴 No Cache(private, max-age=0, must-revalidate, no-cache, no-store)
    cf-cache-status
    DYNAMIC
    cf-ray
    9feb7248ef6a7ad5-BOS
    content-encoding
    zstd
    content-type
    text/html; charset=UTF-8
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    20

    SPF
    DKIM
    DMARC

    MX Records (1)

    ezmail.subnet-calculator.com

    Domain Information

    subnet-calculator.com

    Domain Age
    21y 8m

    Created

    26.09.2004

    Expires

    26.09.2029

    Last Updated

    13.12.2024

    Registrar

    123-Reg Limited

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot
    Privacy policy page linked
    Data Protection Officer mentioned
    Legitimate interest basis 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.
    D
    59/100
    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
    3 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Open Sans

    WCAG Partial
    69/100
    Readability
    /30
    20/30

    14px · LH --

    Hierarchy
    /20
    14/20

    1.43x ratio · ✓ H1→H6

    WCAG
    /25
    19/25

    4.22:1 min contrast

    Performance
    /25
    16/25

    1 font · 5 req

    Heading Font

    Open Sans

    Sans20px

    Body Font

    Open Sans

    Sans14px

    Contrast Ratio

    4.22:1

    1 issue

    Reading Comfort

    ~46 CPL

    Optimal (45–75)
    20px
    h1
    14px
    h2
    14px
    p

    ⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

    ✅ Optimal line length: ~46 chars/line (ideal 45–75 CPL).

    ⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 4.2:1).

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

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

    ✅ Lean font stack: 1 font families keeps load times fast.

    GGoogle FontsFlesch 52

    Color Palette

    5 unique colors
    7.54:1 AAA Dark
    #323232
    Other· 42.800000000000004%
    #c3c7ca
    Other· 5%

    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 AdSenseEzoicSovrnPubMaticOpenXPrebid.js

    Sponsored

    Scripts & Styles

    30 Resources

    20
    Scripts
    10
    Styles
    18
    Async
    0
    Defer

    Top Script Sources

    local(12)pagead2.googlesyndication.com(2)s0.2mdn.net(1)cdn.id5-sync.com(1)d9.flashtalking.com(1)

    Website Identity

    subnet-calculator.com

    21 years old
    Location detected: 🇩🇪 Germanyvia ip
    123-Reg Limiteden

    Sponsored

    Last analyzed: 20 May 2026 at 12:47

    Historical Analysis & Change Tracking