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www.duo.com

Cisco · tier critical (marketing / brand) · 0.3% of the company's traffic weight · scan of 2026-10-17

AWS Route 53DNS (zone duo.com)
AWSEdge
AWS (AS16509)18.172.168.0/21

DNS records

Statuslive
CNAME chain—
A18.172.170.43 18.172.170.95 18.172.170.46 18.172.170.76
AAAA—
Zoneduo.com
Zone NSns-1365.awsdns-42.org ns-1733.awsdns-24.co.uk ns-55.awsdns-06.com ns-932.awsdns-52.net
Origin ASNAS16509 AWS (AS16509)
BGP prefix18.172.168.0/21

HTTP

GET / status301
/cdn-cgi/tracenot probed
cf-raya4c031e23928065f-SEA
locationhttps://duo.com/
servercloudflare
via1.1 8af7e76489ae9222af2304e63d2c0520.cloudfront.net (CloudFront)
x-amz-cf-idWfiPYlOiHrAoxUNOBgDyktC5zXBkFVxsB0MrC0roxRZ4tDwOgYqyOQ==
x-amz-cf-popHIO52-P4
x-cacheHit from cloudfront

Why we classified it this way

DNS

  • AWS Route 53 AWS Route 53 · NS ns-1365.awsdns-42.org, ns-1733.awsdns-24.co.uk, ns-55.awsdns-06.com, ns-932.awsdns-52.net (confidence 95%)

Edge

  • AWS AWS CloudFront (IP range) · A 18.172.170.43 in published aws_cloudfront ranges; x-amz-cf-* / via CloudFront (confidence 93%)

History

ScanStatusDNSEdgeCNAME / AASN
2026-10-17liveAWS Route 53AWS18.172.170.43 18.172.170.95 18.172.170.46 18.172.170.76AS16509
2026-10-17liveAWS Route 53AWS18.172.170.43 18.172.170.76 18.172.170.95 18.172.170.46AS16509