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SGSiteGraph

iisg.amsterdam

IISG | Internationaal Instituut voor Sociale Geschiedenis

Last scanned Aug 24, 2026, 1:21 PM · 1 view

89

Overall score

Great

Summary

This website uses Nginx hosted on SURFNET-NL - SURF B.V., NL. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: Missing meta description.

Netherlands
Hosted on SURFNET-NL - SURF B.V., NL

Top issues to fix

6 issues found · 2 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 meta description

    SEO

    Add a ~150-character meta description to control your search-result snippet and lift click-through rate.

  • No structured data (JSON-LD) found

    SEO

    Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

  • Missing OpenGraph tags

    SEO

    Add og:title/og:description/og:image so shared links render a proper preview card.

  • sitemap.xml not found

    SEO

    Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

  • 1 broken link on the page

    SEO

    Fix or remove broken links — they waste crawl budget and erode user trust.

70

SEO

4 issue(s) found

100

Performance

389 ms

90

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

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

FacebookLinkedInInstagram

Contact

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

Meta tags

Title
IISG | Internationaal Instituut voor Sociale Geschiedenis
Description
Canonical
https://iisg.amsterdam/nl
Language
nl
Charset
utf-8
Viewport
width=device-width, initial-scale=1.0
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
—
og:description
—
og:type
—
og:url
—

Twitter Card

twitter:card
summary
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Nginx

Hosting & CDN

CDN provider
—
IP address
195.169.88.174
ASN
AS1103 (SURFNET-NL - SURF B.V., NL)

DNS records

TypeValue
A
  • 195.169.88.174
AAAA—
MX
  • iisg-amsterdam.mail.protection.outlook.com
TXT
  • 97a19e8229984312941c7be6ebe7851e
  • v=spf1 ip4:195.169.88.200 include:spf.protection.outlook.com -all
  • MS=ms10004713
  • HARICA-ltt11pfWmyZi1f09NuK
  • procurios-site-verification=TDPXEGtsaNtbQm7emacE
  • google-site-verification=fANUAlctiV7-fVgbXF7YhBPf_G16pw8EHFTwXlOyUPc
NS
  • ns0.socialhistoryservices.org
  • ns1.surfnet.nl
  • ns1.zurich.surf.net
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Hellenic Academic and Research Institutions CA
Subject
iisg.amsterdam
Valid from
Jul 22, 2026
Valid to
Feb 6, 2027
Days until expiry
165
SAN domains
iisg.amsterdam

Security headers

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

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 9 · H3 1

Links

52 internal · 15 external · 1 broken

Images

14 total · 0 missing alt

Scripts / Styles

7 scripts · 6 stylesheets

JS / CSS size

510 KB · 116 KB

Page size

69.0 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
34
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Missing meta description
  • No structured data (JSON-LD) found
  • Missing OpenGraph tags
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://iisg.amsterdam
Final URL
https://iisg.amsterdam/nl
HTTP status
200
HTTP version
HTTP/2
Response time
388 ms
HTML size
69.0 KB
Redirect chain
https://iisg.amsterdam → https://iisg.amsterdam/nl

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does iisg.amsterdam use?
iisg.amsterdam is built with Nginx.
Is iisg.amsterdam secure (HTTPS)?
Yes. iisg.amsterdam uses TLS 1.3 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Feb 6, 2027.
Who hosts iisg.amsterdam?
iisg.amsterdam is hosted on SURFNET-NL - SURF B.V., NL.
What is iisg.amsterdam's SEO score?
iisg.amsterdam scored 70/100 for SEO in the latest analysis (fair).
What is iisg.amsterdam's overall website score?
iisg.amsterdam has an overall SiteGraph score of 89/100, combining SEO, performance, security, and accessibility.