Verifying against the live site and live WHOIS/DNS…
Common questions
Is iisg.nl legit or a scam?
iisg.nl was registered May 23, 1994 (32 years old), per public registration records. AboutUs doesn't label sites "legit" or "a scam": this page lists the dated registration, DNS, HTTPS, mail-authentication and safety checks we could verify, each with its source, so you can decide for yourself.
Who owns iisg.nl?
Nobody has completed AboutUs's owner verification for iisg.nl. That's true of most sites here — it isn't itself a warning sign.
When was iisg.nl registered?
iisg.nl's registration dates to May 23, 1994 (32 years old), per public registration records. SURF B.V. is the registrar on record today.
Correct a description, link or other detail. Submissions are reviewed before publication.
Lifeline · iisg.nl over time
Checked in the last 30 daysOlder, dated recordFrom registration records
Registered 32 years ago · on AboutUs since 2006 · one registrar since Feb 10, 2025 · 1 registrant change since 2009 · last checked Nov 10, 2026.
Registration
RegisteredMay 23, 1994iisg.nl was registered on May 23, 1994.Source: RDAP, fetched Nov 10, 2026
AboutUs record
AboutUs wiki pageAboutUs wiki pageJun 20, 2006 – Nov 12, 2013An AboutUs wiki page described iisg.nl from Jun 20, 2006 to Nov 12, 2013 (3 edits).Source: AboutUs wiki archive, 2006–2023Said about itself in 2006Jul 1, 2006
Registrar
SURF B.V.SURF B.V.Feb 10, 2025 – Oct 21, 2026 (latest)Registrar SURF B.V. in the registration data recorded, first on Feb 10, 2025 and most recently on Oct 21, 2026.Source: RDAP, fetched Nov 10, 2026
Registrant
Registrant recordsJan 13, 2009 – Jun 21, 2026Registration records for iisg.nl are held from Jan 13, 2009 to Jun 21, 2026 (17 records). 1 change of registrant name or organization is marked. Privacy-service and redaction changes, renames of the same organization and new contacts at it are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Zone file
Nameservers: socialhistoryservices.org, surf.net, surfnet.nlFeb 10, 2025 – Jun 21, 2026Registration records listed socialhistoryservices.org, surf.net, surfnet.nl nameservers (ns0.socialhistoryservices.org, ns1.surfnet.nl, ns1.zurich.surf.net) for iisg.nl from Feb 10, 2025 to Jun 21, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Certificate
Hellenic Academic and Research Institutions CAHellenic Academic and Research Institutions CAAug 27, 2025 – Nov 13, 2026 (latest)Hellenic Academic and Research Institutions CA issued 34 certificates for iisg.nl from Aug 27, 2025, the latest valid until Feb 21, 2027. Seen in use on Oct 11, 2026.Source: Certificate Transparency logs (AboutUs's own certificate-log reader); TLS check, Oct 11, 2026
200020102020Jan ’26Oct ’26← last 12 months, drawn wider
Every dated fact on this lifeline (10)
May 23, 1994Registration: iisg.nl was registered on May 23, 1994.Source: RDAP, fetched Nov 10, 2026
Jun 20, 2006 – Nov 12, 2013AboutUs record: An AboutUs wiki page described iisg.nl from Jun 20, 2006 to Nov 12, 2013 (3 edits).Source: AboutUs wiki archive, 2006–2023
Jul 1, 2006AboutUs record: “One of the world's largest documentary and research centres in the field of social history”Source: AboutUs wiki archive, 2006
Jan 13, 2009 – Jun 21, 2026Registrant: Registration records for iisg.nl are held from Jan 13, 2009 to Jun 21, 2026 (17 records). 1 change of registrant name or organization is marked. Privacy-service and redaction changes, renames of the same organization and new contacts at it are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Feb 10, 2025 – Oct 21, 2026Registrar: Registrar SURF B.V. in the registration data recorded, first on Feb 10, 2025 and most recently on Oct 21, 2026.Source: RDAP, fetched Nov 10, 2026
Feb 10, 2025Registrant: The registrant name or organization in the registration record changed; first recorded Feb 10, 2025. That can be a rename, a new contact or a sale; the record alone does not say which.
“One of the world's largest documentary and research centres in the field of social history”
Source: AboutUs wiki archive, 2006
Current AboutUs recordJun 23, 2026 – Nov 10, 2026 (latest)Authority and Safety last refreshed Nov 10, 2026.Source: AboutUs checks
Registrant changeFeb 10, 2025The registrant name or organization in the registration record changed; first recorded Feb 10, 2025. That can be a rename, a new contact or a sale; the record alone does not say which.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
1 registrant change, 2009–2026
Let's EncryptMar 28, 2026 – Nov 13, 2026Let's Encrypt issued 37 certificates for iisg.nl from Mar 28, 2026, the latest valid until Feb 8, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Feb 10, 2025 – Jun 21, 2026Zone file: Registration records listed socialhistoryservices.org, surf.net, surfnet.nl nameservers (ns0.socialhistoryservices.org, ns1.surfnet.nl, ns1.zurich.surf.net) for iisg.nl from Feb 10, 2025 to Jun 21, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Aug 27, 2025 – Nov 13, 2026Certificate: Hellenic Academic and Research Institutions CA issued 34 certificates for iisg.nl from Aug 27, 2025, the latest valid until Feb 21, 2027. Seen in use on Oct 11, 2026.Source: Certificate Transparency logs (AboutUs's own certificate-log reader); TLS check, Oct 11, 2026
Mar 28, 2026 – Nov 13, 2026Certificate: Let's Encrypt issued 37 certificates for iisg.nl from Mar 28, 2026, the latest valid until Feb 8, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Jun 23, 2026 – Nov 10, 2026AboutUs record: Authority and Safety last refreshed Nov 10, 2026.Source: AboutUs checks
2 of 4 safety checks passed (Nov 13, 2026).
Registered 1994 · site answered with HTTP 403
Iisg.nl Institute of Social History, Amsterdam
One of the world's largest documentary and research centres in the field of social history
Make sure the site responds over HTTPS with a valid certificate.
Page metadata (passed)
Security headers (failed)
Add the HSTS, Content-Security-Policy, and X-Frame-Options response headers.
AboutUs has not vetted this site. Everything below is what we could measure automatically. Anything you do on the site — paying, sharing personal details, downloading — is between you and the site, not AboutUs.
Current facts
Latest available measurements; dated entries retain their dates. These are measurements, not an endorsement of the site.
latest result
Domain registered May 23, 1994 — 32 years old.
latest result
Registrar on record: SURF B.V. — unchanged since AboutUs began tracking (Sep 9, 2026).
checked Sep 30, 2026
The live front page reads as an education or reference site that is a public service, mainly for specialists in its field.
Authority 69/100— ahead of 69% of the August 2026 scored sampleClear
Why this authority score
69 is a percentile: higher than 69% of sites we score.
How it's calculated
Prominence (Tranco rank #145,818)+5
Verified continuity: 32.5 years (RDAP registration)+11
Security & email hygiene+5
Calibration adjustment (published map)+14
Model score: 35/99 — what these reason lines add up to.
Published Authority (percentile): 69/100 — this site's rank against the August 2026 scored sample. Public Authority is capped at 99.
Safety evidence
Retained threat-feed result (recorded about 2 days ago); name-similarity check available (recorded about 2 days ago); 3/3 transport and email checks available (oldest recorded about 2 days ago). This is evidence coverage, not a probability that a website is safe.
What iisg.nl said about itself, 2006
Quoted from the site's AboutUs wiki page in each year it changed (1 version). These are the page's own words at the time, not AboutUs's assessment. New words · dropped words
2006
One of the world's largest documentary and research centres in the field of social history
Site history
Dated record — historical facts always carry their date.