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Domain report

duocards.com

duocards.com ranks in the top 0.14% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 7 distinct hosts observed under it.

Explore duocards.com in the Web Graph

Connectivity

#183,424harmonic-centrality rank
Top percentile
0.14%
Hosts observed
7

From the Common Crawl cc-main-2026-jul-aug-sep hyperlink graph, 133,241,980 domains total. What this rank means

HTTPS reachability

200HTTP status

https://duocards.com/ answered with HTTP 200.

DNS records

A
  • 172.67.200.235
  • 104.21.36.237
AAAA
  • 2606:4700:3035::6815:24ed
  • 2606:4700:3031::ac43:c8eb
MX
  • 1 wes1-mx1.wedos.net.
  • 1 wes1-mx2.wedos.net.
  • 10 wes1-mx-backup.wedos.net.
NS
  • carla.ns.cloudflare.com.
  • kayden.ns.cloudflare.com.

Live preview

This is a live, sandboxed embed of duocards.com — not a copy. What it shows can change any time the site itself does.

Domain registration (WHOIS / RDAP)

RDAP lookup failed (HTTP 429).

How to read WHOIS and RDAP data

SSL certificate

Certificate Transparency lookup failed (HTTP 429).

How to check when a certificate expires

HTTP & security headers

Response

Server
cloudflare
Content-Type
text/html; charset=utf-8
Cache-Control
public, max-age=0, must-revalidate
Content-Encoding
Not sent

Security

Content-Security-Policy
Not sent
Strict-Transport-Security
max-age=15552000; includeSubDomains; preload
X-Frame-Options
Not sent
X-Content-Type-Options
nosniff
Referrer-Policy
strict-origin-when-cross-origin
Permissions-Policy
Not sent

What each security header does

Redirect chain

  1. 1.http://duocards.com/HTTP 301

    → https://duocards.com/

  2. 2.https://duocards.com/HTTP 301

    → https://duocards.com/en/

  3. 3.https://duocards.com/en/HTTP 200

Meta tags

Title
DuoCards - Learn languages using Flashcards.
Description
Language flashcard app. Enjoy learning from videos, movies or articles. Learn a language using flashcards. Learn by watching videos in your target language.
Canonical
https://duocards.com/en/
Robots
index, follow, max-image-preview:large
Generator
Not set
Open Graph title
DuoCards - Learn languages using Flashcards.
Open Graph description
Language flashcard app. Enjoy learning from videos, movies or articles. Learn a language using flashcards. Learn by watching videos in your target language.
Open Graph image
https://duocards.com/images/2022/08/duocards-fb-logo1000x530.jpg
Open Graph type
website
Twitter card
summary_large_image
Twitter title
DuoCards - Learn languages using Flashcards.
Twitter image
https://duocards.com/images/2022/08/duocards-fb-logo1000x530.jpg

robots.txt

Disallow rules (User-agent: *)
0
Disallow rules (other agents)
0

Sitemap declared:

  • https://duocards.com/sitemap-index.xml

Technology detected

Best-effort, based on a small set of well-known signals — this may be incomplete.

  • Cloudflarecdn

    Server: cloudflare

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