hdfgroup.org

https://hdfgroup.org· First analyzed 01 May 2026· Updated 01 May 2026

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hdfgroup.org

Mobile

Sponsored

Hosting Provider

SourceDNS

IP Address

67.227.248.143

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Lansing, United States

ASN

AS32244

Organization

SourceDNS

Server

Apache

CDN

Azure Cdn

Nameservers

ns3-08.azure-dns.org.ns4-08.azure-dns.info.ns1-08.azure-dns.com.ns2-08.azure-dns.net.

Performance

Core Web Vitals

Weight

First Contentful Paint

857 ms10%

Speed Index

1.1 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.8 MB

47 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.8.2

cms

Astrav4.11.12

by Brainstorm Force

View Theme

Technology Stack

19 Technologies Detected

Plugins

Auth0 Download Manager Tlp Team

Gravity Forms

Gravityformssurvey

Simple Cloudflare Turnstile

Libraries

CSS Frameworks

Icon Libraries

Analytics

Tag Managers

Payments

Web Servers

Languages

SEO Analysis

C68/100

Meta Tags7/15

Content8/12

Headings3/8

Technical20/21

E-E-A-T2/7

Images4/7

Links5/5

URL5/5

Social4/5

Freshness4/4

Mobile3/4

Indexability3/3

hdfgroup.orghdfgroup.org

The HDF Group - The HDF Group - ensuring long-term access and usabi...

Our non-profit mission is to ensure efficient and equitable access to science and engineering data across platforms and environments, now and forever. The HD...

Title truncated. Description truncated.

Title Length124 chars

Recommended: 50-60 chars (~759px / 580px)

Description Length371 chars

Recommended: 120-160 chars

Issues (2)

• Title is too long (124 chars, ~759px). Will be truncated in search results.
• Missing H1 tag — every page should have exactly one H1

10 issues found

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Local SEO

Local Search Readiness

18/100

Poor

5 12

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

D51/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

8/25

Citation

16/25

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:2%

Words:477

Token eff.:Optimal

Structured Data

4 JSON-LD

Organization×1.1WebSiteBreadcrumbListSearchAction

sameAs entity links

Citation Readiness

Opening Summary159w

Descriptive Headingsavg 2w

Canonical URL

Open Graph2/3

Twitter Card1/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (10)

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.

83/100

Passed

Critical

Warnings

Images & Alt Text

15/20

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

Semantic Structure

13/20

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

15/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

10/15

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.

29/100

230 mg

CO₂e / view

1.8 MB

Page Weight

50%

Cleaner Than

New Visitor

263 mg

Returning (cached)

132 mg

Annual (10K/mo)

27.6 kg

Emission Segments

Data Center

51 mg

Network

55 mg

Device

124 mg

Resource Breakdown

JavaScript

412.3 KB

Images

432.6 KB

CSS

821.1 KB

HTML

194.8 KB

Green Hosting Not Verified

SourceDNS

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

52d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

24.03.2026

Valid Until

22.06.2026

Subject Alternative Names (2)

hdfgroup.orgwww.hdfgroup.org

SHA-256 Fingerprint

A7:05:01:01:7B:81:30:48:41:34:EE:6A:FE:48:16:97:E7:A3:0E:11...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-type

text/html; charset=UTF-8

date

Fri, 01 May 2026 17:15:17 GMT

link

<https://www.hdfgroup.org/wp-json/>; rel="https://api.w.org/...

server

Apache/2.4.66 (AlmaLinux)

x-powered-by

PHP/8.1.34

set-cookie

__wpdm_client

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

hdfgroup-org.mail.protection.outlook.com

Domain Information

hdfgroup.org

Domain Age

22 years

Created

23.04.2004

Expires

23.04.2027

Last Updated

24.03.2026

Registrar

Amazon Registrar, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

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.

79/100

Mobile Friendly95 breakpoints

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

-apple-system

WCAG AA

76/100

Readability

/30

25/30

16px · LH 1.65

Hierarchy

/20

6/20

WCAG

/25

23/25

4.94:1 min contrast

Performance

/25

22/25

System fonts

Heading Font

-apple-system

Sans

Body Font

-apple-system

Sans16px

Contrast Ratio

4.94:1

WCAG AA (≥4.5:1)

Reading Comfort

~42 CPL

Narrow lines

27px

16px

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

⚠️ Hard to read: Flesch score 41/100. Simplify sentences for wider reach.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 4.9:1).

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

✅ Modern fluid typography: clamp() with rem units ensures zoom accessibility (WCAG 1.4.4).

✅ System fonts: Zero font loading delay — best possible LCP impact.

Fluid Type (rem)Flesch 41

Color Palette

7 unique colors

Light

#ffffff

Background· 54.5%

#c8d2d3

Primary· 20.5%

#6287be

Secondary· 5.7%

#abdbb5

Secondary· 0.8%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

hdfgroup.org(17)googletagmanager.com(3)

Website Identity

The HDF Group - ensuring long-term access and usability of HDF data and supporting users of HDF technologies

Organization

The HDF Group is a not-for-profit corporation with the mission of sustaining the HDF technologies and supporting HDF user communities worldwide with production-quality software and services.

www.hdfgroup.org/

22 years old

Location detected: 🇺🇸 United Statesvia ip

Amazon Registrar, Inc.📧 Microsoft 365en-US

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Last analyzed: 01 May 2026 at 17:16

Historical Analysis & Change Tracking