duo.com

Observed Jul 24, 2026, 02:40 UTC (3h ago). Every field below was attested with an Ed25519 signature at scan time. Catalog observation, re-checked on rotation — watch it for 5-minute checks.

Verify this receipt yourself + Watch this domain

Up right now

Runs onAmazon

Email byGoogle (SPF sender)

Secured byAmazon

Registered withMarkMonitor Inc.

Also usesGoogle Search Console

3 subdomains · cybersecurity_expanded

Every line above is a signed observation. Check the math at the bottom of the page.

INFRASTRUCTURE MAPwhat duo.com actually stands on - every host below is a signed observation

duo.com

A / AAAA

3.171.38.1153.171.38.1003.171.38.193.171.38.67

Amazonserves the site

ns-1365.awsdns-42.orgns-1733.awsdns-24.co.ukns-55.awsdns-06.comns-932.awsdns-52.net

awsdns-42.org + awsdns-24.co.uk + moreanswers its DNS

alln-mx-01.cisco.comrcdn-mx-01.cisco.comaer-mx-01.cisco.com

Google (SPF sender)receives its email

TLS

www.duosecurity.com

Amazonissued its certificate

DNS Records

A 4

3.171.38.115
3.171.38.100
3.171.38.19
3.171.38.67

MX 3

10alln-mx-01.cisco.com
20rcdn-mx-01.cisco.com
30aer-mx-01.cisco.com

TXT 16

apple-domain-verification=0NFHW4xLPA7qMAUl
google-site-verification=88KLpNEv0nOJ-yRHH3mp3TIvrG4rhNTP3DbODLQeIYg
google-site-verification=F16Zf7RnF8CVcYnsbn6C308KFSeldSRrLiJK1cCgoBQ
google-site-verification=FyHTkA00weOnJqC50U6D_1Etz0FeTAV36UzX-mR0t7Y
google-site-verification=QSlNcf5REPqDzZZtYQdQ02iTtFdCkF4iGzRgOHWeAfk
google-site-verification=UxTqzaF64RMmCuE_cfz67aerfbJyPW7jSWJaDRf8U4Q
google-site-verification=WvGzO9Z62GF-06EZawhrguz4lX-3soAJz8l5Zdd0kpc
google-site-verification=_6xJQkVWQvhjZ8WH17r2qEjOu0CYifwUq5DqV-aUPIE
google-site-verification=gY1gXbTT44Hc2xjnx-TmKdBLXKzpthxWKGhlqJL0EDw
google-site-verification=uo-yyMBObeQzZDH55aAFLRLyf0IiN20p0GJ0H6N2jQQ

NS 4

ns-1365.awsdns-42.org
ns-1733.awsdns-24.co.uk
ns-55.awsdns-06.com
ns-932.awsdns-52.net

SOA 1

ns-55.awsdns-06.com awsdns-hostmaster.amazon.com

CAA 10

issue "amazon.com"
issue "amazonaws.com"
issue "amazontrust.com"
issue "awstrust.com"
issue "digicert.com"
issue "globalsign.com"
issue "identrust.com"
issue "letsencrypt.org"
issue "pki.goog"
issue "starfieldtech.com"

TLS Certificates (3)

Common Name	Issuer	Expires
`www.duosecurity.com`	C=US, O=Amazon, CN=Amazon RSA 2048 M04	Sat, 05 Dec 2026 23:59:59 +0000
`Amazon RSA 2048 M04`	C=US, O=Amazon, CN=Amazon Root CA 1	Fri, 23 Aug 2030 22:26:35 +0000
`Amazon Root CA 1`	C=US, ST=Arizona, L=Scottsdale, O=Starfield Technologies, Inc., CN=Starfield Services Root Certificate Authority - G2	Thu, 31 Dec 2037 01:00:00 +0000

Subdomains (3)

The proof

Signed at scan time. Check the math yourself. Every line above is part of one signed observation. Re-hash it and check the Ed25519 signature in your own browser; nothing leaves your machine.

Verify this receipt

Put the receipt on your own site. A live badge showing what DomainDrift observes and signs for duo.com. It updates itself. It attests a signed observation - not that the site is safe.

<a href="https://domaindrift.io/t/duo.com">
  <img src="https://domaindrift.io/badge/duo.com.svg"
       width="300" height="64" alt="DomainDrift signed observations for duo.com">
</a>

Ed25519 Receipt

Receipt ID: rcpt_e50e7235bea702e0
Output Hash: 87f5e39efe413a82b1fede0b6b2f0d58704590205b475814c45ae101550504a4
Signature: ed25519:3d84155246cea1239b814f973eda5cc378a16c4d2160edc906c65723abb7e99cd6ce38a9ad3a6503047d0d0e81b39192384a0e0273334549a26e9f61c1cb860e
Public Key: ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent: (genesis)
Plane: fast

Verify this in your browser

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