🌐
substack.us 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 143d
Domain Expires When the domain registration expires. If not renewed, the domain becomes available to others.Read more →
N/A
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 →
0/3
IP Address The numerical address of the server hosting this website. Reveals location, provider, and network.Read more →
76.223.54.146
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
65
mob
Uptime
100%
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability. 65
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Mobile
Score
Accessibility
Best Practices
SEO
LCP
4.48s
CLS
0.000
FCP
2.93s
TTFB
0.01s
TBT
401ms
SI
5.72s
Checked: 2026-09-05 02:57:13.241452 · View on PageSpeed
Tech Stack Technologies detected on this website: CMS, frameworks, libraries, CDN, and analytics tools.
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No technologies detected
Screenshot
2026-09-02
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Captured: 2026-09-02 09:15:59 · 0.5 KB
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) | 76.223.54.14613.248.169.48 |
| NS | ns2.aftermarket.comns1.aftermarket.com |
| MX | 0 |
| TXT (9) |
+8 other TXT record(s)
Show all TXT recordsb1198016f11f430d90bc203138862a91 sl-verification= v=spf1 include:simplelogin.co ~all 9b291e26-36b4-4798-8c54-b3eee39b08b8 38528a2e91f7e340aea4b4d1b1213a870c081ed6 37a35edbe5b525922f98ea969ce27af0abe0088b aftermarket-verification=cURAUA== afternic-verification-2YE7qnRyyzDRdUip7SmukM 29f4cd4b7d6e460d84c74ae48fd24d84 |
WHOIS / RDAP Public registration data: who registered the domain, when, and when it expires.Read more →
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| Registrar | N/A |
| Registered | N/A |
| Expires | N/A |
| Last Updated | N/A |
SSL Certificate Encrypts the connection between browsers and this website. Valid SSL = HTTPS works.Read more → Valid
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| Subject (CN) | substack.us |
| Issuer | GoDaddy.com |
| Valid From | 2026-08-22 |
| Valid Until | 2027-03-08 (143 days left) |
| SANs (1) | substack.us |
HTTP Headers Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
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| Status | 200 |
| Server | N/A |
| Content-Type | text/html |
| Final URL | https://substack.us/ |
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 | 76.223.54.146 |
| Provider | Unknown |
| Organization | N/A |
| ASN | N/A |
| Location | N/A |
Security Score
F (1/7)
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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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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:simplelogin.co ~all |
| DMARC | Not set |
| MX Records | 0 → |
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 | 24ms |
| Last Checked | 2026-10-15 04:15:36.076316 |
| Uptime (30d) | 100% |
Similar Sites
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Similarity based on content analysis. More results appear as more domains are indexed.