substack.com
Substack
substack.com is registered with Amazon Registrar, Inc. since April 27, 2010 (16.5 years). The registration expires on April 27, 2030. The site runs on Express, Substack, Cloudflare and 3 other technologies. Its email security grade is B. Its SSL certificate is issued by Google Trust Services and is valid for 38 more days.
- Domain age
- 16.5 yrs
- Technologies
- 6
- Email security
- B
- SSL days left
- 38
Registration
| Registrar | Amazon Registrar, Inc. |
|---|---|
| IANA ID | 468 |
| Registered | April 27, 2010 |
| Expires | April 27, 2030 |
| Updated | May 16, 2026 |
| Status | client transfer prohibited |
| Name servers | ali.ns.cloudflare.com, lee.ns.cloudflare.com |
| DNSSEC | Not signed |
DNS records
| Type | Value | TTL |
|---|---|---|
| A | 104.18.37.200 | 270 |
| A | 172.64.150.56 | 270 |
| MX | mxa.mailgun.org 10 | 300 |
| MX | mxb.mailgun.org 10 | 300 |
| NS | ali.ns.cloudflare.com | 85311 |
| NS | lee.ns.cloudflare.com | 85311 |
| TXT | facebook-domain-verification=8vbxp2ntmkudc6is3h5r840c9fwo7f | 300 |
| TXT | google-site-verification=4V_X38Yf0J4VJcWFwtG38bOS1nkOWeIWJhticlMgNQE | 300 |
| TXT | google-site-verification=DAkdykID6WqQM6tT7IfSu9_uB7-qIdB039MA_C3T3eA | 300 |
| TXT | google-site-verification=FfNIQIxsRHpj3Y7E_d3N6GFqGgWDZ-sfYojqCilwtqE | 300 |
| TXT | google-site-verification=SXEl7_p4SBszcanSWwVc_3-RFky80c0-94janbeeWI4 | 300 |
| TXT | google-site-verification=vQEKLOUDfKNOQAv9W3EUMiRD6e5ibAEPhc2yCzP7big | 300 |
| TXT | tiktok-developers-site-verification=7PgqCAJ52ILLOqf2KELd8uaRfJpuzaLQ | 300 |
| TXT | tiktok-developers-site-verification=A9XRSo8lWy5CPFJ0bqI04KCpUZGAAq7p | 300 |
| TXT | v=spf1 include:_spf.google.com include:mailgun.org include:mail.zendesk.com ~all | 300 |
| AAAA | 2606:4700:4404::6812:25c8 | 276 |
| AAAA | 2606:4700:4401::ac40:9638 | 276 |
Technology stack
SSL certificate
| Valid | Valid |
|---|---|
| Issuer | US, WE1, Google Trust Services |
| Expires | December 18, 2026 |
| Days remaining | 38 |
| Protocol | TLSv1.3 |
| Names | substack.com, *.substack.com |
Email security
- 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).
- goodDMARC policy is reject: mail that fails authentication is blocked.
- goodDMARC aggregate reports are sent to mailto:[email protected].
- goodDKIM keys found (selector: google).
- good2 MX record(s) found. Mail is handled by Mailgun.
Homepage metadata
| Title | Substack |
|---|---|
| Description | Substack is the app for independent voices: a free newsletter, video, and podcast hosting platform with paid subscriptions built in. |
| Language | en |
| Canonical | https://substack.com/ |
| Indexable | Yes |
| Word count | 345 |
About substack.com
Who is the registrar of substack.com?
substack.com is registered with Amazon Registrar, Inc. (IANA ID 468).
When does substack.com expire?
The current registration of substack.com expires on April 27, 2030. It was first registered on April 27, 2010.
What technology does substack.com use?
We detected 6 technologies on substack.com, including Cloudflare, Substack, Node.js, Content Security Policy, HSTS, Express.
Does substack.com protect its email with SPF and DMARC?
substack.com scores 83/100 (grade B) for email security. No MTA-STS: mail sent to you can be downgraded to an unencrypted connection. No TLS-RPT record, so you won't hear about failed encrypted deliveries.
What are the name servers of substack.com?
substack.com uses ali.ns.cloudflare.com, lee.ns.cloudflare.com.