🌐 duolingo.us 200 🔒 SSL Valid
Checked: just now 🔗 Visit site
↪
This domain forwards to duolingo.com (checked 0d ago)
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 67d
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 →
1/3
IP Address ?The numerical address of the server hosting this website. Reveals location, provider, and network.Read more →
18.209.181.30
Performance ?Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
44 mob
Uptime
100%
⚡ Performance ?Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability. 44
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Mobile
44
Score
82
Accessibility
77
Best Practices
100
SEO
LCP 12.48s
CLS 0.000
FCP 4.85s
TTFB 0.00s
TBT 780ms
SI 4.85s
Desktop
48
Score
83
Accessibility
77
Best Practices
92
SEO
LCP 2.60s
CLS 0.000
FCP 1.09s
TTFB 0.00s
TBT 791ms
SI 4.03s
Checked: 2026-09-05 09:17:53.444208 · 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
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Screenshot not available yet.

🌐 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)18.209.181.3052.204.255.1723.95.82.7154.196.223.12598.87.134.16598.95.124.137
NSns-1837.awsdns-37.co.ukns-222.awsdns-27.comns-545.awsdns-04.netns-1147.awsdns-15.org
📋 WHOIS / RDAP ?Public registration data: who registered the domain, when, and when it expires.Read more →
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RegistrarN/A
RegisteredN/A
ExpiresN/A
Last UpdatedN/A
🔒 SSL Certificate ?Encrypts the connection between browsers and this website. Valid SSL = HTTPS works.Read more → Valid
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Subject (CN)*.duolingo.com
IssuerAmazon
Valid From2025-11-25
Valid Until2026-12-24 (67 days left)
SANs (1)*.duolingo.com
📡 HTTP Headers ?Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
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Status200
Serverduo-api
Content-Typetext/html; charset=UTF-8
Final URLhttps://www.duolingo.com/
x-frame-optionsSAMEORIGIN
cache-controlno-store, no-cache, must-revalidate, proxy-revalidate
x-cacheMiss from cloudfront
via1.1 f3ecbc97d0db514065204b13ac00b05a.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 →
HSTS
Content-Security-Policy
X-Frame-Options
🏠 Hosting ?Physical infrastructure: where the server is, who operates it, and what network it belongs to.Read more →
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IP Address18.209.181.30
ProviderUnknown
OrganizationN/A
ASNN/A
LocationN/A
🛡️ Security Score F (2/7)
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Valid SSL
HSTS
CSP
X-Frame-Options
X-Content-Type
Referrer-Policy
Permissions-Policy
🗺️ 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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SPFNot set
DMARCNot set
🌍 Other TLDs ?Other top-level domain variants of this domain name and their availability. 21 active 1 for sale 1 available
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.com ●
.net ●
.org ●
.info ●
.io ●
.co ●
.dev taken
.app ●
.me ●
.biz ●
.eu ●
.xyz ●
.fi Available
.se ●
.de ●
.uk ●
.fr ●
.nl ●
.es ●
.it ●
.us current
.ca ●
.com.au ●
.co.uk ●
📡 Uptime Monitor
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Current Status 🟢 Online
HTTP Status 200
Response Time 125ms
Last Checked 2026-10-17 06:15:57.721662
Uptime (30d) 100%