duo.com

Observed 2026-07-14T01:41:11.440Z (10h ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Runs onCloudflare

Email byGoogle (SPF sender)

Registered withMarkMonitor Inc.

Also usesGoogle Search Console

8 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

18.154.101.7018.154.101.12918.154.101.3818.154.101.92

Cloudflareserves the site

ns-932.awsdns-52.netns-55.awsdns-06.comns-1733.awsdns-24.co.ukns-1365.awsdns-42.org

awsdns-52.net + awsdns-06.com + moreanswers its DNS

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

Google (SPF sender)receives its email

HTTPS probe

ok Responding normally (2xx) 200 OK

HTTP status200

Servercloudflare

TLS protocolHTTP/2

TLS issuernot observed

Behind Cloudflareyes

Response time244 ms

DNS resolutionNOERROR

Every field above is part of the same signed observation as the records below. Blank means not observed, never "none".

DNS Records

A 4

18.154.101.70
18.154.101.129
18.154.101.38
18.154.101.92

MX 3

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

TXT 17

google-site-verification=gY1gXbTT44Hc2xjnx-TmKdBLXKzpthxWKGhlqJL0EDw
google-site-verification=UxTqzaF64RMmCuE_cfz67aerfbJyPW7jSWJaDRf8U4Q
identrust_validate=SMpkw2Y899uXgKrzdHnqptIfXiIOyDNlX1foFF1S209M
google-site-verification=WvGzO9Z62GF-06EZawhrguz4lX-3soAJz8l5Zdd0kpc
google-site-verification=F16Zf7RnF8CVcYnsbn6C308KFSeldSRrLiJK1cCgoBQ
google-site-verification=88KLpNEv0nOJ-yRHH3mp3TIvrG4rhNTP3DbODLQeIYg
apple-domain-verification=0NFHW4xLPA7qMAUl
workplace-domain-verification=M0nohbh4MpXazNtpfeLQrdlEAbaeQ3
v=spf1 ip4:72.35.40.113/28 ip4:66.51.154.240/29 include:_spf.google.com include:_spf.salesforce.com include:mktomail.com include:stspg-customer.com include:_spf.intacct.com include:servers.mcsv.net ~all
google-site-verification=zagew00MIXPj4NT7NSuvolRYA9BWUFvOvUU9On5SkLs

NS 4

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

SOA 1

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

CAA 10

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TLS Certificates (0)

None.

Subdomains (8)

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: c3c4ab61-83e1-4c96-9897-add788d835cc
Output Hash: 59cd97dd22c7bae6cf172f125c0bb7d21b263fd616003b2d7e4b2389b7f2124a
Signature: ed25519:5a85e9b145e43f8eb1b02e7ba3ec40b52742a6dbaf28542cf4d44827e75431262e37bff210b4fab1cd5eb5e1f3c316a9984e0ae62febf8b24f7b70823c5d8b0e
Public Key: ed25519:d610d74ef18f683e5beb859d241d5e67dff0c122e8928b06bec1c2476f4ba27b
Parent: (genesis)
Plane: fast

Verify this in your browser

Permalink: https://domaindrift.io/t/duo.com