🌐 duolingo.uk 525 🔒 SSL Valid
Checked: just now 🔗 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 →
525
SSL Expires ?When the SSL certificate expires. An expired certificate causes browser security warnings.Read more →
in 52d
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 →
172.67.138.102
Performance ?Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability.
100 mob
Uptime
100%
⚡ Performance ?Lighthouse performance score from Google PageSpeed Insights (0–100). Measures real-world loading speed, interactivity and visual stability. 100
▼
Mobile
100
Score
68
Accessibility
96
Best Practices
36
SEO
LCP 0.77s
CLS 0.000
FCP 0.77s
TTFB 0.00s
TBT 0ms
SI 1.53s
Desktop
100
Score
68
Accessibility
96
Best Practices
36
SEO
LCP 0.25s
CLS 0.000
FCP 0.25s
TTFB 0.00s
TBT 0ms
SI 0.45s
Checked: 2026-09-05 09:13:29.225966 · 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)172.67.138.102104.21.86.249
AAAA (IPv6)2606:4700:3030::6815:56f92606:4700:3034::ac43:8a66
NSrayden.ns.cloudflare.comlaylah.ns.cloudflare.com
MX20 mx2.improvmx.com10 mx1.improvmx.com
TXT (2)
+1 other TXT record(s)
Show all TXT records
5c8c22891bbc4c49bd7a91b5a592d6a1c7671ed6
v=spf1 include:spf.improvmx.com -all
📋 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.uk
IssuerGoogle Trust Services
Valid From2026-09-09
Valid Until2026-12-08 (52 days left)
SANs (2)duolingo.uk*.duolingo.uk
📡 HTTP Headers ?Metadata sent by the server: reveals software, caching rules, and security configuration.Read more →
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Status525
Servercloudflare
Content-Typetext/plain; charset=UTF-8
Final URLhttps://duolingo.uk/
x-frame-optionsSAMEORIGIN
referrer-policysame-origin
cache-controlprivate, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
cf-raya4b93ab69a49f629-EWR
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 Address172.67.138.102
ProviderUnknown
OrganizationN/A
ASNN/A
LocationN/A
🛡️ Security Score D (3/7)
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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 Missing
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Titleduolingo.uk | 525: SSL handshake failed
Languageen-US
📧 Mail Security ?Email authentication records (SPF & DMARC) that prevent spoofing and phishing from this domain.Read more →
▼
SPF✓ Present
v=spf1 include:spf.improvmx.com -all
DMARCNot set
MX Records
20 → mx2.improvmx.com
10 → mx1.improvmx.com
🌍 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 ●
.me ●
.biz ●
.eu ●
.xyz ●
.fi Available
.se ●
.de ●
.uk current
.fr ●
.nl ●
.es ●
.it ●
.us ●
.ca ●
.com.au ●
.co.uk ●
📡 Uptime Monitor
▼
Current Status 🟢 Server Error
HTTP Status 525
Response Time 322ms
Last Checked 2026-10-15 07:15:05.62328
Uptime (30d) 100%
🔗 Similar Sites 8
▼
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Similarity based on content analysis. More results appear as more domains are indexed.