🌐 duolingo.app ⚠ SSL Issue
Checked: (cached 2026-10-16 12:31:24) ↻ Refresh 🔗 Visit site
HTTP Status ?A three-digit code showing if the site loaded successfully (200), redirects (301/302), or has errors (4xx/5xx).Read more →
N/A
SSL Expires ?When the SSL certificate expires. An expired certificate causes browser security warnings.Read more →
N/A
Domain Expires ?When the domain registration expires. If not renewed, the domain becomes available to others.Read more →
in 197d
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 →
15.197.148.33
Performance ?Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
N/A
Uptime
100%
⚡ Performance ?Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
▼

Performance data not available yet.

🛠️ Tech Stack ?Technologies detected on this website: CMS, frameworks, libraries, CDN, and analytics tools.
▼

No technologies detected

📸 Screenshot Processing...
▼
⏳

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 →
▼
A (IPv4)3.33.130.19015.197.148.33
NSns71.domaincontrol.comns72.domaincontrol.com
📋 WHOIS / RDAP ?Public registration data: who registered the domain, when, and when it expires.Read more →
▼
RegistrarGo Australia Domains, LLC
Registered2018-05-02
Expires2027-05-02 (in 197 days)
Last Updated2026-06-16
Statusclient delete prohibitedclient renew prohibitedclient transfer prohibitedclient update prohibited
🔒 SSL Certificate ?Encrypts the connection between browsers and this website. Valid SSL = HTTPS works.Read more → Invalid / Missing
▼
Subject (CN)N/A
IssuerN/A
Valid FromN/A
Valid UntilN/A
📡 HTTP Headers ?Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
▼
StatusN/A
ServerN/A
Content-TypeN/A
Final URLhttps://duolingo.app/
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 →
▼
IP Address15.197.148.33
ProviderUnknown
OrganizationN/A
ASNN/A
LocationN/A
🛡️ Security Score F (0/7)
▼
Valid SSL
HSTS
CSP
X-Frame-Options
X-Content-Type
Referrer-Policy
Permissions-Policy
🗺️ Sitemap & Robots
▼
No robots.txt
This site has no robots.txt file, so crawlers may access everything by default.
Sitemap Not found
🔗 Social & Meta Tags
▼

No meta tags detected.

📧 Mail Security ?Email authentication records (SPF & DMARC) that prevent spoofing and phishing from this domain.Read more →
▼
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
▼
.com ●
.net ●
.org ●
.info ●
.io ●
.co ●
.dev taken
.app current
.me ●
.biz ●
.eu ●
.xyz ●
.fi Available
.se ●
.de ●
.uk ●
.fr ●
.nl ●
.es ●
.it ●
.us ●
.ca ●
.com.au ●
.co.uk ●
📡 Uptime Monitor
▼
Current Status 🟢 Client Error
HTTP Status 403
Response Time 59ms
Last Checked 2026-10-16 12:45:34.530809
Uptime (30d) 100%