🌐
coursera.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 71d
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 →
2/3
IP Address The numerical address of the server hosting this website. Reveals location, provider, and network.Read more →
67.199.248.13
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
43
mob
Uptime
100%
Performance Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability. 43
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Mobile
Score
Accessibility
Best Practices
SEO
LCP
14.56s
CLS
0.000
FCP
2.20s
TTFB
0.02s
TBT
3,145ms
SI
3.22s
Checked: 2026-09-04 23:27:30.542641 · 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 09:13:24 · 15.1 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) | 67.199.248.1367.199.248.12 |
| NS | ns-1467.awsdns-55.orgns-1966.awsdns-53.co.ukns-318.awsdns-39.comns-734.awsdns-27.net |
| TXT (1) |
v=spf1 -all |
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) | coursera.us |
| Issuer | Let's Encrypt |
| Valid From | 2026-09-28 |
| Valid Until | 2026-12-27 (71 days left) |
| SANs (1) | coursera.us |
HTTP Headers Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
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| Status | 200 |
| Server | envoy |
| Content-Type | text/html |
| Final URL | https://www.coursera.org/ |
| x-powered-by | Express |
| strict-transport-security | max-age=31536000; includeSubDomains; preload |
| x-frame-options | SAMEORIGIN |
| x-content-type-options | nosniff |
| cache-control | private, no-cache, no-store, must-revalidate, max-age=0 |
| x-cache | Miss from cloudfront |
| via | 1.1 acc48333e8e2925c44d46b4d771ee3a4.cloudfront.net (CloudFront) |
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 | 67.199.248.13 |
| Provider | Unknown |
| Organization | N/A |
| ASN | N/A |
| Location | N/A |
Security Score
C (4/7)
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Sitemap & Robots
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No robots.txt
This site has no robots.txt file, so crawlers may access everything by default.
| Sitemap | Not found |
Social & Meta Tags
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No meta tags detected.
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 -all |
| DMARC | ✓ Present v=DMARC1; p=reject; |
Other TLDs Other top-level domain variants of this domain name and their availability. 20 active 1 for sale 2 available
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Uptime Monitor
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| Current Status | 🟢 Online |
| HTTP Status | 200 |
| Response Time | 578ms |
| Last Checked | 2026-10-16 17:31:03.062456 |
| Uptime (30d) | 100% |