Rank #256Updated November 10, 2026
readthedocs.io
Full featured documentation deployment platform - Read the Docs
The site runs on Cloudflare, Font Awesome. Its email security grade is F. Its SSL certificate is issued by Google Trust Services and is valid for 43 more days.
- Domain age
- —
- Technologies
- 2
- Email security
- F
- SSL days left
- 43
DNS records
| Type | Value | TTL |
|---|---|---|
| A | 104.16.254.120 | 300 |
| A | 104.16.253.120 | 300 |
| MX | aspmx.l.google.com 1 | 300 |
| MX | aspmx2.googlemail.com 10 | 300 |
| MX | aspmx3.googlemail.com 10 | 300 |
| MX | alt1.aspmx.l.google.com 5 | 300 |
| MX | alt2.aspmx.l.google.com 5 | 300 |
| NS | ivan.ns.cloudflare.com | 86400 |
| NS | tegan.ns.cloudflare.com | 86400 |
| CAA | issue 0 amazontrust.com | 300 |
| CAA | issue 0 comodoca.com | 300 |
| CAA | issue 0 digicert.com; cansignhttpexchanges=yes | 300 |
| CAA | issue 0 letsencrypt.org | 300 |
| CAA | issue 0 pki.goog; cansignhttpexchanges=yes | 300 |
| CAA | issue 0 ssl.com | 300 |
| CAA | issuewild 0 amazonaws.com | 300 |
| CAA | issuewild 0 comodoca.com | 300 |
| CAA | issuewild 0 digicert.com; cansignhttpexchanges=yes | 300 |
| CAA | issuewild 0 letsencrypt.org | 300 |
| CAA | issuewild 0 pki.goog; cansignhttpexchanges=yes | 300 |
| CAA | issuewild 0 ssl.com | 300 |
| AAAA | 2606:4700::6810:fe78 | 300 |
| AAAA | 2606:4700::6810:fd78 | 300 |
Technology stack
CDN
Fonts
SSL certificate
| Valid | Valid |
|---|---|
| Issuer | US, WE1, Google Trust Services |
| Expires | December 23, 2026 |
| Days remaining | 43 |
| Protocol | TLSv1.3 |
| Names | readthedocs.io, *.readthedocs.io |
Email security
FScore 5/100 across SPF, DMARC, DKIM, MTA-STS and BIMI.
- badNo SPF record. Anyone can send email that claims to come from readthedocs.io.
- badNo DMARC record. Receivers have no instructions for mail that fails SPF and DKIM, and you get no reports about who sends as your domain.
- warnNo DKIM key found at common selectors (google, selector1, selector2, default, k1, k2, s1, s2, ...). DKIM may still use a custom selector we cannot guess.
- 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).
- good5 MX record(s) found. Mail is handled by Google Workspace.
Homepage metadata
| Title | Full featured documentation deployment platform - Read the Docs |
|---|---|
| Description | Read the Docs is a documentation building and hosting platform aimed at helping developers creating documentation from code with versioned documentation, integrated search, pull request previews and more. |
| Language | en |
| Canonical | https://about.readthedocs.com/ |
| Indexable | Yes |
| Word count | 736 |
About readthedocs.io
What technology does readthedocs.io use?
We detected 2 technologies on readthedocs.io, including Cloudflare, Font Awesome.
Does readthedocs.io protect its email with SPF and DMARC?
readthedocs.io scores 5/100 (grade F) for email security. No SPF record. Anyone can send email that claims to come from readthedocs.io. No DMARC record. Receivers have no instructions for mail that fails SPF and DKIM, and you get no reports about who sends as your domain.
What are the name servers of readthedocs.io?
readthedocs.io uses ivan.ns.cloudflare.com, tegan.ns.cloudflare.com.