man7.org
Michael Kerrisk - man7.org
man7.org is registered with Gandi SAS since December 16, 2005 (20.9 years). The registration expires on December 16, 2029. The site runs on Statcounter, Universal Analytics, Apache HTTP Server. Its email security grade is D. Its SSL certificate is issued by Let's Encrypt and is valid for 68 more days.
- Domain age
- 20.9 yrs
- Technologies
- 3
- Email security
- D
- SSL days left
- 68
Registration
| Registrar | Gandi SAS |
|---|---|
| IANA ID | 81 |
| Registered | December 16, 2005 |
| Expires | December 16, 2029 |
| Updated | August 12, 2026 |
| Status | client transfer prohibited |
| Name servers | ns-102-a.gandi.net, ns-203-b.gandi.net, ns-24-c.gandi.net |
| DNSSEC | Not signed |
DNS records
| Type | Value | TTL |
|---|---|---|
| A | 45.84.74.9 | 900 |
| MX | aspmx.l.google.com 1 | 1800 |
| MX | alt3.aspmx.l.google.com 10 | 1800 |
| MX | alt2.aspmx.l.google.com 5 | 1800 |
| MX | alt1.aspmx.l.google.com 5 | 1800 |
| MX | alt4.aspmx.l.google.com 10 | 1800 |
| NS | ns-24-c.gandi.net | 10800 |
| NS | ns-203-b.gandi.net | 10800 |
| NS | ns-102-a.gandi.net | 10800 |
| TXT | v=spf1 include:_spf.google.com ~all | 10800 |
| TXT | google-site-verification=6yqdzWtjBD9BVkrXEriCj0oCiw6p0kAOdZs09mcRoeg | 10800 |
Technology stack
Analytics and advertising IDs
google_analytics:UA-9830363-2SSL certificate
| Valid | Valid |
|---|---|
| Issuer | US, YR1, Let's Encrypt |
| Expires | January 17, 2027 |
| Days remaining | 68 |
| Protocol | TLSv1.3 |
| Names | kerrisk.com, linuxprogramminginterface.com, linuxsystemprogramming.com, linuxsystemsprogramming.com, man7.org, michaelkerrisk.com, thelinuxprogramminginterface.com, trainingfromthefuture.com, www.kerrisk.com, www.linuxprogramminginterface.com, www.linuxsystemprogramming.com, www.linuxsystemsprogramming.com |
Email security
- warnDMARC policy is none (monitoring only). Spoofed mail is still delivered.
- warnDMARC has no rua= address, so you receive no reports about mail sent as your domain.
- warnNo MTA-STS: mail sent to you can be downgraded to an unencrypted connection.
- warnNo TLS-RPT record, so you won't hear about failed encrypted deliveries.
- warnNo BIMI record (optional: shows your logo next to your emails in supporting inboxes).
- goodSPF record found.
- goodSPF ends with ~all: servers you have not listed are marked as suspicious (soft fail).
- goodDKIM keys found (selector: google).
- good5 MX record(s) found. Mail is handled by Google Workspace.
Homepage metadata
| Title | Michael Kerrisk - man7.org |
|---|---|
| Language | en-US |
| Indexable | Yes |
| Word count | 25 |
About man7.org
Who is the registrar of man7.org?
man7.org is registered with Gandi SAS (IANA ID 81).
When does man7.org expire?
The current registration of man7.org expires on December 16, 2029. It was first registered on December 16, 2005.
What technology does man7.org use?
We detected 3 technologies on man7.org, including Statcounter, Universal Analytics, Apache HTTP Server.
Does man7.org protect its email with SPF and DMARC?
man7.org scores 57/100 (grade D) for email security. DMARC policy is none (monitoring only). Spoofed mail is still delivered. DMARC has no rua= address, so you receive no reports about mail sent as your domain.
What are the name servers of man7.org?
man7.org uses ns-24-c.gandi.net, ns-203-b.gandi.net, ns-102-a.gandi.net.