Verifying against the live site and live WHOIS/DNS…
Common questions
Is cas.org legit or a scam?
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 cas.org?
Nobody has completed AboutUs's owner verification for cas.org. That's true of most sites here — it isn't itself a warning sign.
Correct a description, link or other detail. Submissions are reviewed before publication.
Lifeline · cas.org over time
Checked in the last 30 daysOlder, dated recordFrom registration records
On AboutUs since 2014 · 1 registrar change since Jul 9, 2011 · 3 ownership changes since 2011 · last checked Oct 17, 2026.
Registration
No registration date on file yet. AboutUs reads it from RDAP when the site is checked.
AboutUs record
AboutUs wiki pageJan 16, 2014An AboutUs wiki page described cas.org from Jan 16, 2014 to Jan 16, 2014 (1 edit).Source: AboutUs wiki archive, 2006–2023Said about itself in 2013Jul 1, 2013“CAS is a team of scientists, creating and delivering the most complete and effective digital information environment for scientific research and discovery....”Source: AboutUs wiki archive, 2013
Registrar
Network Solutions, LLC (R63-LROR)Network Solutions, LLC (R63-LROR)Jul 9, 2011 – Apr 11, 2014Registrar Network Solutions, LLC (R63-LROR) in the WHOIS and RDAP records held for cas.org, from Jul 9, 2011 to Apr 11, 2014.Source: WHOIS / RDAP archive (who.is)Network Solutions, LLC
Ownership
Ownership recordsJul 9, 2011 – Jun 14, 2026Registration records for cas.org are held from Jul 9, 2011 to Jun 14, 2026 (180 records). 3 changes of registrant name or organization are marked. Privacy-service and redaction changes are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Zone file
Nameservers: cas.org, oar.netNameservers: cas.org, oar.netJul 9, 2011 – Jun 14, 2026Registration records listed cas.org, oar.net nameservers (ns1.oar.net, ns2.oar.net, srv01s4.cas.org) for cas.org from Jul 9, 2011 to Jun 14, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Certificate
AmazonJul 27, 2026 – Oct 26, 2026Amazon issued 58 certificates for cas.org from Jul 27, 2026, the latest valid until May 11, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)Google Trust ServicesJul 28, 2026 – Oct 26, 2026
201520202025Jan ’26Oct ’26← last 12 months, drawn wider
Every dated fact on this lifeline (14)
Jul 9, 2011 – Apr 11, 2014Registrar: Registrar Network Solutions, LLC (R63-LROR) in the WHOIS and RDAP records held for cas.org, from Jul 9, 2011 to Apr 11, 2014.Source: WHOIS / RDAP archive (who.is)
Jul 9, 2011 – Jun 14, 2026Ownership: Registration records for cas.org are held from Jul 9, 2011 to Jun 14, 2026 (180 records). 3 changes of registrant name or organization are marked. Privacy-service and redaction changes are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Jul 9, 2011 – Jun 14, 2026Zone file: Registration records listed cas.org, oar.net nameservers (ns1.oar.net, ns2.oar.net, srv01s4.cas.org) for cas.org from Jul 9, 2011 to Jun 14, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Jul 1, 2013AboutUs record: “CAS is a team of scientists, creating and delivering the most complete and effective digital information environment for scientific research and discovery....”Source: AboutUs wiki archive, 2013
Jan 16, 2014AboutUs record: An AboutUs wiki page described cas.org from Jan 16, 2014 to Jan 16, 2014 (1 edit).Source: AboutUs wiki archive, 2006–2023
Current AboutUs record
Jun 19, 2026 – Aug 20, 2026 (latest)
Authority and Safety last refreshed Aug 20, 2026.
Source: AboutUs checks
Network Solutions, LLC
Jul 4, 2016 – Oct 22, 2026 (latest)
Registrar Network Solutions, LLC (IANA 2) in the registration data recorded, first on Jul 4, 2016 and most recently on Oct 22, 2026.
Source: RDAP, fetched Jun 21, 2026
Ownership change
Feb 12, 2018
The registrant name or organization in the registration record changed; first recorded Feb 12, 2018. Who it changed to is in the full report.
Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Ownership changeJul 14, 2020The registrant name or organization in the registration record changed; first recorded Jul 14, 2020. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Ownership changeJul 6, 2022The registrant name or organization in the registration record changed; first recorded Jul 6, 2022. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
3 ownership changes, 2011–2026
Google Trust Services issued 10 certificates for cas.org from Jul 28, 2026, the latest valid until Jan 6, 2027.
Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Sectigo LimitedJul 30, 2026 – Oct 26, 2026 (latest)Sectigo Limited issued 72 certificates for cas.org from Jul 30, 2026, the latest valid until May 9, 2027. Seen in use on Oct 17, 2026.Source: Certificate Transparency logs (AboutUs's own certificate-log reader); TLS check, Oct 17, 2026
Let's EncryptAug 1, 2026 – Oct 26, 2026Let's Encrypt issued 10 certificates for cas.org from Aug 1, 2026, the latest valid until Jan 21, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Jul 4, 2016 – Oct 22, 2026
Registrar: Registrar Network Solutions, LLC (IANA 2) in the registration data recorded, first on Jul 4, 2016 and most recently on Oct 22, 2026.Source: RDAP, fetched Jun 21, 2026
Feb 12, 2018Ownership: The registrant name or organization in the registration record changed; first recorded Feb 12, 2018. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Jul 14, 2020Ownership: The registrant name or organization in the registration record changed; first recorded Jul 14, 2020. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Jul 6, 2022Ownership: The registrant name or organization in the registration record changed; first recorded Jul 6, 2022. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Jun 19, 2026 – Aug 20, 2026AboutUs record: Authority and Safety last refreshed Aug 20, 2026.Source: AboutUs checks
Jul 27, 2026 – Oct 26, 2026Certificate: Amazon issued 58 certificates for cas.org from Jul 27, 2026, the latest valid until May 11, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Jul 28, 2026 – Oct 26, 2026Certificate: Google Trust Services issued 10 certificates for cas.org from Jul 28, 2026, the latest valid until Jan 6, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Jul 30, 2026 – Oct 26, 2026Certificate: Sectigo Limited issued 72 certificates for cas.org from Jul 30, 2026, the latest valid until May 9, 2027. Seen in use on Oct 17, 2026.Source: Certificate Transparency logs (AboutUs's own certificate-log reader); TLS check, Oct 17, 2026
Aug 1, 2026 – Oct 26, 2026Certificate: Let's Encrypt issued 10 certificates for cas.org from Aug 1, 2026, the latest valid until Jan 21, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Registered 1989 · site is live · HTTPS valid
Chemical Abstracts Service (CAS) produces Chemical Abstracts and SciFinder, and co-operates STN International—databases providing access to chemical, scientific, patent, medical, and regulatory information for researchers and professionals in chemistry, engineering, and related fields.
Authority 78/100— ahead of 78% of the August 2026 scored sampleClear
Why this authority score
78 is a percentile: higher than 78% of sites we score.
How it's calculated
Prominence (Tranco rank #26,141)+8
Verified continuity: 37.2 years (RDAP registration)+11
Identity corroboration (capped)+4
Security & email hygiene+3
Calibration adjustment (published map)+14
Model score: 40/99 — what these reason lines add up to.
Published Authority (percentile): 78/100 — this site's rank against the August 2026 scored sample. Public Authority is capped at 99.
What cas.org said about itself, 2013
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
2013
CAS is a team of scientists, creating and delivering the most complete and effective digital information environment for scientific research and discovery....
Site history
Dated record — historical facts always carry their date; self-description below is the 2014 record.
1989
Domain registered (Sep 5, 1989).
2014
First tracked by AboutUs (Jan 16, 2014).
2014
Self-description at the time:
“Chemical Abstracts Service, CAS, is the producer of Chemical Abstracts, SciFinder, and co-partner in operating STN International, all of which provide comprehensive, authoritative, and reliable”
✓ domain continuity 37 years registered✓ live verified Oct 26, 2026
Safety evidence
No unexpired threat-feed result; name-similarity check available (recorded about 66 days ago); 3/3 transport and email checks available (oldest recorded about 66 days ago). This is evidence coverage, not a probability that a website is safe.
No caution flags in the available scoring observations; this is not a complete safety assessment