opendefinition.org
The Open Definition - Open Definition - Defining Open in Open Data, Open Content and Open Knowledge
Last scanned Jul 27, 2026, 3:43 PM
Overall score
Great
Summary
The Open Definition - Open Definition - Defining Open in Open Data, Open Content and Open Knowledge. This website uses Plausible Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is good (80/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.
The Open Definition - Open Definition - Defining Open in Open Data, Open Content and Open Knowledge
- United States
- Hosted on Cloudflare
Top issues to fix
7 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Title longer than 60 characters
SEOShorten the title to under 60 characters so search results don't truncate it.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
+1 more issue — details in the sections below.
SEO
3 issue(s) found
Performance
233 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
The Open Definition - Open Definition - Defining Open in Open Data, Open Content and Open Knowledge
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- The Open Definition - Open Definition - Defining Open in Open Data, Open Content and Open Knowledge
- Description
- The Open Definition - Open Definition - Defining Open in Open Data, Open Content and Open Knowledge
- Canonical
- https://opendefinition.org/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.67.138.172
- ASN
- AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX | — |
| TXT | — |
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- opendefinition.org
- Valid from
- Jun 1, 2026
- Valid to
- Aug 30, 2026
- Days until expiry
- 34
- SAN domains
- opendefinition.org, *.opendefinition.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 1 · H3 0
Links
50 internal · 14 external · 0 broken
Images
10 total · 1 missing alt
Scripts / Styles
6 scripts · 4 stylesheets
JS / CSS size
32.1 KB · 12.1 KB
Page size
27.7 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- 165
SEO issues
- Title longer than 60 characters
- No structured data (JSON-LD) found
- Missing OpenGraph tags
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://opendefinition.org
- Final URL
- https://opendefinition.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 233 ms
- HTML size
- 27.7 KB
- Redirect chain
- https://opendefinition.org
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does opendefinition.org use?
- opendefinition.org is built with Plausible Analytics, Cloudflare Analytics.
- Is opendefinition.org secure (HTTPS)?
- Yes. opendefinition.org uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Aug 30, 2026.
- Who hosts opendefinition.org?
- opendefinition.org is hosted on Cloudflare, behind Cloudflare CDN.
- What is opendefinition.org's SEO score?
- opendefinition.org scored 80/100 for SEO in the latest analysis (great).
- What is opendefinition.org's overall website score?
- opendefinition.org has an overall SiteGraph score of 85/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card