Registered 28 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 228 ms.
Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

| A | 34.49.79.89 |
|---|---|
| AAAA | 2600:1901:0:d50b:: |
| MX | 10 alt4.aspmx.l.google.com 10 alt3.aspmx.l.google.com 1 aspmx.l.google.com 5 alt2.aspmx.l.google.com 5 alt1.aspmx.l.google.com |
| NS | ns-cloud-b3.googledomains.com ns-cloud-b4.googledomains.com ns-cloud-b1.googledomains.com ns-cloud-b2.googledomains.com |
| TXT | bw=8FWhDisk9A5pIZaRqgEVlw9bmNX2JfRXqrMEIQ7H3LDq google-site-verification=UcenFo8BSxiqYnF3VG-WR2sRg5sA6_rqD95uHRd1XCQ v=spf1 include:_spf.mailgun.org include:_spf.google.com include:spf.ourmailsender.com include:mail.zendesk.com include:amazonses.com mx:openssl.org -all google-site-verification=gSC0oSoa_ORUbibpFTgJOzjCiSO1RbQvSLAFNf_Rlyc MS=ms30329591 anthropic-domain-verification-aak9cc=zhKPG1Uo7ZmC2C0SRXdTupz4B google-site-verification=Vfn-VvIAKa3dsUvBlPcoj9Fs9n4vjWvTNRblV_fqJJY openai-domain-verification=dv-yMgwPMed7LsPUgnVC7wKD1yQ |
| CAA | {'type': 'CAA', 'issue': 'letsencrypt.org', 'critical': 0} {'type': 'CAA', 'iodef': 'mailto:sec@openssl.org', 'critical': 0} |
| registrar | Gandi SAS |
|---|---|
| registered | 1998-12-19 |
| expires | 2032-12-19 |
| last changed | 2026-10-16 |
| owner | OpenSSL Software Foundation Inc. |
| nameservers | ns-cloud-b1.googledomains.com ns-cloud-b4.googledomains.com ns-cloud-b2.googledomains.com ns-cloud-b3.googledomains.com |
| status | client transfer prohibited |
| valid | yes |
|---|---|
| issuer | Let's Encrypt |
| covers | openssl.org, www.openssl.org |
| protocol | TLSv1.3 |
Domain is properly signed — chain validated by an independent validating resolver
| SPF | pass v=spf1 include:_spf.mailgun.org include:_spf.google.com include:spf.ourmailsender.com include:mail.zendesk.com include:amazonses.com mx:openssl.org -all |
|---|---|
| DMARC | pass policy quarantine |
| DKIM | found: google |
Whether mail claiming to be from this domain can be checked as genuine.
Green: clean. Red: listed. Grey: the list did not answer.
Agents get this as data. Bought through the API, the checks behind this page cost $0.070: profile $0.025 + trust $0.020 + screenshot $0.020 + site status $0.005.
MCP: add https://how.is/mcp to Claude, Codex or Cursor
(one-line install) and ask for domain_trust on openssl.org.
Reference: /llms.txt.
IPv6. Does openssl.org work over IPv6? See the live check on aaaa.bot — website, mail and nameservers, graded A–F.
Watch openssl.org. DNS read at the source every 5 minutes; certificate, blocklists and expiry every 6 hours. You get an email only when something changes.
Watch — $1 / 30 days