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Common questions
Is combinatorics.org legit or a scam?
combinatorics.org was registered Sep 21, 1996 (30 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 combinatorics.org?
Nobody has completed AboutUs's owner verification for combinatorics.org. That's true of most sites here — it isn't itself a warning sign.
When was combinatorics.org registered?
combinatorics.org's registration dates to Sep 21, 1996 (30 years old), per public registration records. Network Solutions, LLC is the registrar on record today.
Correct a description, link or other detail. Submissions are reviewed before publication.
Lifeline · combinatorics.org over time
Checked in the last 30 daysOlder, dated recordFrom registration records
Registered 30 years ago · on AboutUs since 2006 · one registrar since Jul 8, 2017 · 2 registrant changes since 2017 · last checked Nov 11, 2026.
Registration
RegisteredSep 21, 1996combinatorics.org was registered on Sep 21, 1996.Source: RDAP, fetched Nov 11, 2026
AboutUs record
AboutUs wiki pageJun 19, 2006 – Dec 29, 2007An AboutUs wiki page described combinatorics.org from Jun 19, 2006 to Dec 29, 2007 (3 edits).Source: AboutUs wiki archive, 2006–2023Said about itself in 2006Jul 1, 2006“Electronic journal maintained by the American Mathematical Society.”
Registrar
Network Solutions, LLCNetwork Solutions, LLCJul 8, 2017 – Sep 30, 2026 (latest)Registrar Network Solutions, LLC (IANA 2) in the registration data recorded, first on Jul 8, 2017 and most recently on Sep 30, 2026.Source: RDAP, fetched Nov 11, 2026
Registrant
Registrant recordsJul 8, 2017 – May 13, 2026Registration records for combinatorics.org are held from Jul 8, 2017 to May 13, 2026 (39 records). 2 changes of registrant name or organization are 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: worldnic.comNameservers: worldnic.comJul 8, 2017 – May 13, 2026Registration records listed worldnic.com nameservers (ns31.worldnic.com, ns32.worldnic.com) for combinatorics.org from Jul 8, 2017 to May 13, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Certificate
Let's EncryptMay 26, 2026 – Nov 15, 2026Let's Encrypt issued 3 certificates for combinatorics.org from May 26, 2026, the latest valid until Dec 22, 2026.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
200020102020Jan ’26Oct ’26← last 12 months, drawn wider
Every dated fact on this lifeline (10)
Sep 21, 1996Registration: combinatorics.org was registered on Sep 21, 1996.Source: RDAP, fetched Nov 11, 2026
Jun 19, 2006 – Dec 29, 2007AboutUs record: An AboutUs wiki page described combinatorics.org from Jun 19, 2006 to Dec 29, 2007 (3 edits).Source: AboutUs wiki archive, 2006–2023
Jul 1, 2006AboutUs record: “Electronic journal maintained by the American Mathematical Society.”Source: AboutUs wiki archive, 2006
Jul 8, 2017 – Sep 30, 2026Registrar: Registrar Network Solutions, LLC (IANA 2) in the registration data recorded, first on Jul 8, 2017 and most recently on Sep 30, 2026.Source: RDAP, fetched Nov 11, 2026
Jul 8, 2017 – May 13, 2026Registrant: Registration records for combinatorics.org are held from Jul 8, 2017 to May 13, 2026 (39 records). 2 changes of registrant name or organization are 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
Jul 8, 2017 – May 13, 2026Registration records listed worldnic.com nameservers (ns31.worldnic.com, ns32.worldnic.com) for combinatorics.org from Jul 8, 2017 to May 13, 2026.
Source: AboutUs wiki archive, 2006
Current AboutUs recordJul 11, 2026 – Nov 11, 2026 (latest)Authority and Safety last refreshed Nov 11, 2026.Source: AboutUs checks
Registrant changeJul 30, 2020The registrant name or organization in the registration record changed; first recorded Jul 30, 2020. 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
Registrant changeAug 29, 2025The registrant name or organization in the registration record changed; first recorded Aug 29, 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
2 registrant changes, 2017–2026
Zone file:
Source: From registration records (WHOIS / RDAP archive, who.is)
Jul 30, 2020Registrant: The registrant name or organization in the registration record changed; first recorded Jul 30, 2020. 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
Aug 29, 2025Registrant: The registrant name or organization in the registration record changed; first recorded Aug 29, 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
May 26, 2026 – Nov 15, 2026Certificate: Let's Encrypt issued 3 certificates for combinatorics.org from May 26, 2026, the latest valid until Dec 22, 2026.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Jul 11, 2026 – Nov 11, 2026AboutUs record: Authority and Safety last refreshed Nov 11, 2026.Source: AboutUs checks
0 of 2 safety checks passed (Nov 15, 2026).
Registered 1996 · AboutUs could not get a response over HTTPS when it checked (Nov 15, 2026)
Combinatorics.org
Electronic journal maintained by the American Mathematical Society.
Add a public A or AAAA record so the domain resolves.
HTTPS (failed)
Make sure the site responds over HTTPS with a valid certificate.
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 Sep 21, 1996 — 30 years old.
latest result
Registrar on record: Network Solutions, LLC — unchanged since AboutUs began tracking (Aug 15, 2026).
Authority 39/100— ahead of 39% of the August 2026 scored sampleSome caution flags
Why this authority score
39 is a percentile: higher than 39% of sites we score.
How it's calculated
Prominence (Tranco rank #280,853)+5
Verified continuity: 30.2 years (RDAP registration)+11
Security & email hygiene+1
Calibration adjustment (published map)+5
Model score: 22/99 — what these reason lines add up to.
Published Authority (percentile): 39/100 — this site's rank against the August 2026 scored sample. Public Authority is capped at 99.
Safety evidence
No unexpired threat-feed result; name-similarity check available (recorded about 3 days ago); 3/3 transport and email checks available (oldest recorded about 3 days ago). This is evidence coverage, not a probability that a website is safe.
Recorded HTTPS check did not confirm a valid connection
No MX and no DMARC (mild)
What combinatorics.org 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
Electronic journal maintained by the American Mathematical Society.
Site history
Dated record — historical facts always carry their date.