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kb.duo.com

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

AWS Route 53DNS (zone duo.com)
AWSEdge
AWS (AS16509)52.85.129.0/24

DNS records

Statuslive
CNAME chain—
A52.85.129.103 52.85.129.126 52.85.129.35 52.85.129.120
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 prefix52.85.129.0/24

HTTP

GET / status301
/cdn-cgi/tracenot probed
cf-raya4c03200786e065f-SEA
locationhttps://help.duo.com/
servercloudflare
via1.1 ffe9646b2ea911744e2d51fc0715cedc.cloudfront.net (CloudFront)
x-amz-cf-idE_6XBdiJ7IgEhEq5LyU2H1Taelsutz2nwug_MTCxaiwc-IwVhIPNTA==
x-amz-cf-popSEA900-P10
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 52.85.129.103 in published aws_cloudfront ranges; x-amz-cf-* / via CloudFront (confidence 93%)

History

ScanStatusDNSEdgeCNAME / AASN
2026-10-17liveAWS Route 53AWS52.85.129.103 52.85.129.126 52.85.129.35 52.85.129.120AS16509
2026-10-17liveAWS Route 53AWS52.85.129.103 52.85.129.35 52.85.129.126 52.85.129.120AS16509