What technology does eso.org use?

eso.org is built with Django, Nginx.

Is eso.org secure (HTTPS)?

Yes. eso.org uses TLS 1.2 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Oct 8, 2026.

Hosting provider information for eso.org is not available yet.

What is eso.org's SEO score?

eso.org scored 70/100 for SEO in the latest analysis (fair).

What is eso.org's overall website score?

eso.org has an overall SiteGraph score of 82/100, combining SEO, performance, security, and accessibility.

Has eso.org's score changed over time?

eso.org's overall score has improved by 1 point (from 81 to 82) since Jul 25, 2026.

eso.org

ESO

Last scanned Aug 1, 2026, 7:00 AM · 13 views

Overall score

Great

Summary

ESO, European Organisation for Astronomical Research in the Southern Hemisphere. This website uses Nginx. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (90/100). Top issue: Missing canonical link.

ESO, European Organisation for Astronomical Research in the Southern Hemisphere

Top issues to fix

10 issues found · 1 high priority

Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
1 cookie without Secure/HttpOnly flags
Security
Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.
Multiple H1 headings found
SEO
Keep a single H1 per page and demote the others to H2/H3.

+4 more issues — details in the sections below.

SEO

5 issue(s) found

Performance

2.43 s

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

+1 overall since Jul 25, 2026

Overall: 82
SEO: 70
Security: 75
Performance: 90
Accessibility: 100

Organization

Company details published in this site's own structured data.

ESO, European Organisation for Astronomical Research in the Southern Hemisphere

Facebook Instagram YouTube LinkedIn YouTube YouTube

Contact

Email, phone, and address published on this site's own pages.

Email: information@eso.org

Meta tags

Title: ESO
Description: ESO, European Organisation for Astronomical Research in the Southern Hemisphere
Canonical
Language: en
Charset: utf-8
Viewport: width=device-width, initial-scale=1
Robots meta: index,follow
Manifest

Technologies

Detected frameworks, languages, and tools.

Django Nginx

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.2
Issuer: Hellenic Academic and Research Institutions CA
Subject: www.eso.org
Valid from: Oct 8, 2025
Valid to: Oct 8, 2026
Days until expiry: 68
SAN domains: www.eso.org, cms-author2i.hq.eso.org, astronet.sc.eso.org, next.eso.org, aaboard.eso.org, cms-pdispatch2.hq.eso.org, cms-pdispatch2i.hq.eso.org, cms-author.hq.eso.org, cms-publish2.hq.eso.org, w4.hq.eso.org, duo.eso.org, duo2020.eso.org, esoads.eso.org, demo.eso.org, groupware.eso.org, messenger.eso.org, wwwi.eso.org, cms-adispatchi.hq.eso.org, cms-author1.hq.eso.org, cms-pdispatch1i.hq.eso.org, pmpd.eso.org, usersupport.eso.org, almasw.hq.eso.org, cms-adispatch1i.hq.eso.org, cms-author1i.hq.eso.org, w2n.hq.eso.org, w4n.hq.eso.org, cms-publish.hq.eso.org, cms-pdispatchi.hq.eso.org, w1ni.hq.eso.org, cms-pdispatch.hq.eso.org, media.eso.org, cms-adispatch.hq.eso.org, elt.eso.org, cms-adispatch1.hq.eso.org, pensioners.eso.org, elti.hq.eso.org, cms-adispatch2i.hq.eso.org, w1n.hq.eso.org, mailman.hq.eso.org, cms-pdispatch1.hq.eso.org, www.hq.eso.org, cms-publish2i.hq.eso.org, cms-publish1.hq.eso.org, cms-adispatch2.hq.eso.org, wwwfo.eso.org, elti.eso.org, wwwi.hq.eso.org, cms-publish1i.hq.eso.org, bienestar.eso.org, eso.org, cms-author2.hq.eso.org, w2ni.hq.eso.org

Security headers

Strict-Transport-SecurityEnabled
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 1 cookie(s) observed

Content & assets

Headings

H1 5 · H2 5 · H3 0

Links

296 internal · 22 external · 20 broken

Images

24 total · 2 missing alt

Scripts / Styles

4 scripts · 2 stylesheets

JS / CSS size

87.9 KB · 111 B

Page size

187 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Missing canonical link
Multiple H1 headings found
No structured data (JSON-LD) found
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://eso.org
Final URL: https://www.eso.org/public/
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 2.42 s
HTML size: 187 KB
Redirect chain: https://eso.org → https://www.eso.org/public/

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Frequently asked questions

What technology does eso.org use?: eso.org is built with Django, Nginx.
Is eso.org secure (HTTPS)?: Yes. eso.org uses TLS 1.2 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Oct 8, 2026.
Who hosts eso.org?: Hosting provider information for eso.org is not available yet.
What is eso.org's SEO score?: eso.org scored 70/100 for SEO in the latest analysis (fair).
What is eso.org's overall website score?: eso.org has an overall SiteGraph score of 82/100, combining SEO, performance, security, and accessibility.
Has eso.org's score changed over time?: eso.org's overall score has improved by 1 point (from 81 to 82) since Jul 25, 2026.