Domain Intelligence Report

duo.com

DNS records, WHOIS/RDAP registration, SSL certificate, subdomain enumeration, and email-security posture — aggregated in real time and cached.

6
DNS record types
68d
SSL cert remaining
23
Subdomains found
SPF + DMARC
Email security
DNS

DNS Records

All record types resolved from authoritative DNS for duo.com.

A 4 records
  • 18.239.168.44
  • 18.239.168.89
  • 18.239.168.112
  • 18.239.168.28
MX 3 records
  • 10 alln-mx-01.cisco.com.
  • 20 rcdn-mx-01.cisco.com.
  • 30 aer-mx-01.cisco.com.
TXT 15 records
  • "google-site-verification=_6xJQkVWQvhjZ8WH17r2qEjOu0CYifwUq5DqV-aUPIE"
  • "google-site-verification=QSlNcf5REPqDzZZtYQdQ02iTtFdCkF4iGzRgOHWeAfk"
  • "google-site-verification=F16Zf7RnF8CVcYnsbn6C308KFSeldSRrLiJK1cCgoBQ"
  • "google-site-verification=88KLpNEv0nOJ-yRHH3mp3TIvrG4rhNTP3DbODLQeIYg"
  • "apple-domain-verification=0NFHW4xLPA7qMAUl"
  • "google-site-verification=WvGzO9Z62GF-06EZawhrguz4lX-3soAJz8l5Zdd0kpc"
  • "identrust_validate=SMpkw2Y899uXgKrzdHnqptIfXiIOyDNlX1foFF1S209M"
  • "google-site-verification=gY1gXbTT44Hc2xjnx-TmKdBLXKzpthxWKGhlqJL0EDw"
  • "identrust_validate=VOOjXXB2PpF7kC14MiiEHi40phwnkIP1dhJ1AbyZxWKP"
  • "workplace-domain-verification=M0nohbh4MpXazNtpfeLQrdlEAbaeQ3"
  • "google-site-verification=zagew00MIXPj4NT7NSuvolRYA9BWUFvOvUU9On5SkLs"
  • "google-site-verification=UxTqzaF64RMmCuE_cfz67aerfbJyPW7jSWJaDRf8U4Q"
  • "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=uo-yyMBObeQzZDH55aAFLRLyf0IiN20p0GJ0H6N2jQQ"
  • "google-site-verification=FyHTkA00weOnJqC50U6D_1Etz0FeTAV36UzX-mR0t7Y"
NS 4 records
  • ns-1365.awsdns-42.org.
  • ns-1733.awsdns-24.co.uk.
  • ns-55.awsdns-06.com.
  • ns-932.awsdns-52.net.
CAA 10 records
  • 0 issue "starfieldtech.com"
  • 0 issue "amazon.com"
  • 0 issue "amazonaws.com"
  • 0 issue "amazontrust.com"
  • 0 issue "awstrust.com"
  • 0 issue "digicert.com"
  • 0 issue "globalsign.com"
  • 0 issue "identrust.com"
  • 0 issue "letsencrypt.org"
  • 0 issue "pki.goog"
SOA 1 record
  • ns-55.awsdns-06.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Registration

WHOIS / RDAP

Registration data for duo.com via the RDAP protocol, with port-43 WHOIS fallback if RDAP is unavailable.

whois via rdap.org
Registrar
MarkMonitor Inc.
Created
1998-10-14T04:00:00Z
Updated
2024-06-24T04:16:28Z
Expires
2027-10-13T04:00:00Z
Handle
5585937_DOMAIN_COM-VRSN
Nameservers
NS-1365.AWSDNS-42.ORGNS-1733.AWSDNS-24.CO.UKNS-55.AWSDNS-06.COMNS-932.AWSDNS-52.NET
Status
client delete prohibitedclient transfer prohibitedclient update prohibited
TLS

SSL Certificate

Live TLS handshake against duo.com. No third-party scanner.

ssl 68 days remaining
Issuer
CN=Amazon RSA 2048 M02,O=Amazon,C=US
Subject
CN=www.duosecurity.com
Valid from
2025-06-22T00:00:00+00:00
Valid to
2026-07-20T23:59:59+00:00
Serial
12915733075743962486886275301582659529
SANs (8)
www.duosecurity.comduosecurity.co.ukfr.duo.comwww.duosecurity.co.ukduo.comde.duo.comwww.duo.comduosecurity.com
Reconnaissance

Subdomains discovered

Aggregated from Certificate Transparency logs (crt.sh, certspotter, hackertarget) with DNS bruteforce fallback if all CT sources fail.

⚠ Partial results — crt.sh status 502
subdomains 23 found
crt.sh status 502 certspotter ok +23 hackertarget ok +0
  • assets.duo.com
  • community.duo.com
  • de.duo.com
  • demo.duo.com
  • duo.com
  • ecosystem.duo.com
  • fr.duo.com
  • go.duo.com
  • guide.duo.com
  • help.duo.com
  • ideas.duo.com
  • kb.duo.com
  • labs.duo.com
  • levelup.duo.com
  • missions.duo.com
  • msp.duo.com
  • resources.duo.com
  • signup.duo.com
  • status.duo.com
  • techpartners.duo.com
  • thebananastand.duo.com
  • verify.duo.com
  • www.duo.com
Email

Email Security Posture

SPF and DMARC presence and records for duo.com. DKIM requires a known selector and is not auto-discoverable.

SPF present
  • 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
DMARC present
  • v=DMARC1; p=reject; sp=reject; adkim=r; aspf=r; fo=1; rf=afrf; pct=100; ri=86400; ruf=mailto:thknwdkw@fr.dmarcian.com; rua=mailto:thknwdkw@ag.dmarcian.com
DKIM selector required

DKIM requires selector; not auto-discoverable

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