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Domain report

duo.com

duo.com ranks in the top 0.0016% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 21 distinct hosts observed under it.

Explore duo.com in the Web Graph

Connectivity

#2,170harmonic-centrality rank
Top percentile
0.0016%
Hosts observed
21

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://duo.com/ answered with HTTP 200.

DNS records

A
  • 18.155.75.91
  • 18.155.75.17
  • 18.155.75.94
  • 18.155.75.51
AAAA
No records found.
MX
  • 10 alln-mx-01.cisco.com.
  • 20 rcdn-mx-01.cisco.com.
  • 30 aer-mx-01.cisco.com.
NS
  • ns-1365.awsdns-42.org.
  • ns-1733.awsdns-24.co.uk.
  • ns-55.awsdns-06.com.
  • ns-932.awsdns-52.net.

Live preview

Screenshot of duo.com

This site's Content-Security-Policy restricts embedding to specific origins ("frame-ancestors 'self' resources.duo.com learn-cloudsecurity.cisco.com"), which does not include StatsMyWeb.

Since duo.com can't be embedded live, this is a captured screenshot instead — a snapshot from whenever it was last rendered, not necessarily this exact moment.

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
max-age=300
Content-Encoding
Not sent

Security

Content-Security-Policy
frame-ancestors 'self' resources.duo.com learn-cloudsecurity.cisco.com;
Strict-Transport-Security
max-age=63072000; includeSubDomains; preload
X-Frame-Options
Not sent
X-Content-Type-Options
nosniff
Referrer-Policy
no-referrer-when-downgrade
Permissions-Policy
Not sent

What each security header does

Redirect chain

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

    → https://duo.com/

  2. 2.https://duo.com/HTTP 200

Meta tags

Title
IAM & MFA Identity Security for Business, Humans, AI | Cisco Duo
Description
Cisco Duo secures workforce access and defends against advanced identity threats with IAM, phishing-resistant MFA, SSO, passwordless, and device trust.
Canonical
https://duo.com
Robots
index, follow, archive
Generator
Not set
Open Graph title
IAM & MFA Identity Security for Business, Humans, AI | Cisco Duo
Open Graph description
Cisco Duo secures workforce access and defends against advanced identity threats with IAM, phishing-resistant MFA, SSO, passwordless, and device trust.
Open Graph image
https://duo.com/assets/img/seo-images/social-share-home.jpg
Open Graph type
website
Twitter card
summary_large_image
Twitter title
IAM & MFA Identity Security for Business, Humans, AI | Cisco Duo
Twitter image
https://duo.com/assets/img/seo-images/social-share-home.jpg

robots.txt

Disallow rules (User-agent: *)
1
Disallow rules (other agents)
0

Sitemap declared:

  • https://duo.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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