🌐
substack.info 200
🔒 SSL Valid
HTTP Status A three-digit code showing if the site loaded successfully (200), redirects (301/302), or has errors (4xx/5xx).Read more →
200
SSL Expires When the SSL certificate expires. An expired certificate causes browser security warnings.Read more →
in 36d
Domain Expires When the domain registration expires. If not renewed, the domain becomes available to others.Read more →
in 164d
Hosting The company and location where this website's server is physically located.Read more →
Unknown
Security Score based on key HTTP security headers: HSTS, Content-Security-Policy, and X-Frame-Options.Read more →
3/3
IP Address The numerical address of the server hosting this website. Reveals location, provider, and network.Read more →
104.18.37.126
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
99
mob
Uptime
100%
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability. 99
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Mobile
Score
Accessibility
Best Practices
SEO
LCP
1.59s
CLS
0.000
FCP
1.59s
TTFB
0.00s
TBT
0ms
SI
1.59s
Desktop
Score
Accessibility
Best Practices
SEO
LCP
0.45s
CLS
0.000
FCP
0.45s
TTFB
0.00s
TBT
0ms
SI
0.45s
Checked: 2026-09-05 02:52:15.918798 · View on PageSpeed
Tech Stack Technologies detected on this website: CMS, frameworks, libraries, CDN, and analytics tools. 1
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🌐 CDN
Cloudflare
Screenshot
Processing...
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⏳
Screenshot is being captured...
DNS Records DNS translates domain names to IP addresses. Records control where the site, email, and services are directed.Read more →
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| A (IPv4) | 172.64.150.130104.18.37.126 |
| AAAA (IPv6) | 2a06:98c1:3106::ac40:96822606:4700:440b::6812:257e |
| NS | ali.ns.cloudflare.comlee.ns.cloudflare.com |
| MX | 10 mxa.mailgun.org10 mxb.mailgun.org |
| TXT (2) |
Services configured via TXT:
Google
Show all TXT recordsv=spf1 include:_spf.google.com include:mailgun.org ~all google-site-verification=vQEKLOUDfKNOQAv9W3EUMiRD6e5ibAEPhc2yCzP7big |
WHOIS / RDAP Public registration data: who registered the domain, when, and when it expires.Read more →
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| Registrar | Gandi SAS |
| Registered | 2019-03-29 |
| Expires | 2027-03-29 (in 164 days) |
| Last Updated | 2026-08-11 |
| Status | client transfer prohibited |
SSL Certificate Encrypts the connection between browsers and this website. Valid SSL = HTTPS works.Read more → Valid
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| Subject (CN) | substack.info |
| Issuer | Google Trust Services |
| Valid From | 2026-08-23 |
| Valid Until | 2026-11-21 (36 days left) |
| SANs (2) | substack.info*.substack.info |
HTTP Headers Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
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| Status | 200 |
| Server | cloudflare |
| Content-Type | text/html |
| Final URL | https://substack.cloudflareaccess.com/cdn-cgi/access/login/substack.info?kid=b64e2221df8c1db4de70fc128a537912ff990886433bb1d2acb0bfe18ce382e5&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjllOWU3NWNhM2IwMDljMjBjMDliNmFjZjcyODI1N2I4MzYxOWQxZTU4NDI3OTZlMjYzMDNkMzA1MTQzODNiYjIifQ.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.OfZX2NlW_l0f71ngpbQekC1sjwZoNP63l-n851CRPWDqPNSSLKQkSk_o07_AT8WSIHnwlrWocz-4t7GE-BAkVo06N7kTezqKynG2XTwnUNPJnf0fZwGWJPQDD-q1JxIZQHyuPoU7Rx_eXuQcZFaFaJj9eb0HSetYmvf78UqKnXS7AzbYl06a7fEtMYtgNlHXIYtG9gKVJB4KxunMZVIljnFSXMzp-QSv66CcnU-ucKr9pmtqt0_gXMU4EwYO_1b3VcAgxzwghvx-S2ggIOul5wGxTYDrehvEPRdP2TmUaDn79YKg4mgwcVS-3VMdhuuuuPdliPkHmLfFDoLYSMUttw&redirect_url=%2F |
| strict-transport-security | max-age=31536000; includeSubDomains |
| content-security-policy | frame-ancestors 'none'; connect-src 'self' http://127.0.0.1:*; default-src https: 'unsafe-inline' |
| x-frame-options | DENY |
| x-content-type-options | nosniff |
| referrer-policy | strict-origin-when-cross-origin |
| cf-ray | a4b4b8d8ad6ac998-IAD |
Security headers HTTP headers that protect visitors from attacks. HSTS forces HTTPS, CSP controls resource loading, X-Frame-Options prevents clickjacking.Read more →
Hosting Physical infrastructure: where the server is, who operates it, and what network it belongs to.Read more →
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| IP Address | 104.18.37.126 |
| Provider | Unknown |
| Organization | N/A |
| ASN | N/A |
| Location | N/A |
Security Score
A (6/7)
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Sitemap & Robots
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Open to search engines
This site's robots.txt lets crawlers access its main content. Search engines can index it normally.
No paths are disallowed — everything is crawlable.
| Sitemap | Not found |
Social & Meta Tags
Missing
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| Title | Sign in ・ Cloudflare Access |
Mail Security Email authentication records (SPF & DMARC) that prevent spoofing and phishing from this domain.Read more →
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| SPF | ✓ Present v=spf1 include:_spf.google.com include:mailgun.org ~all |
| DMARC | ✓ Present v=DMARC1; p=reject; pct=100; rua=mailto:[email protected]; sp=none; aspf=r; |
| MX Records | 10 → mxa.mailgun.org 10 → mxb.mailgun.org |
Other TLDs Other top-level domain variants of this domain name and their availability. 20 active 3 for sale
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Uptime Monitor
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| Current Status | 🟢 Online |
| HTTP Status | 200 |
| Response Time | 507ms |
| Last Checked | 2026-10-15 04:15:09.806097 |
| Uptime (30d) | 100% |
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