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knowledge.duosecurity.com

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

AWS Route 53DNS (zone duosecurity.com)
AWSEdge
AWS (AS16509)143.204.160.0/21

DNS records

Statuslive
CNAME chain—
A143.204.160.105 143.204.160.55 143.204.160.114 143.204.160.40
AAAA—
Zoneduosecurity.com
Zone NSns-1271.awsdns-30.org ns-1600.awsdns-08.co.uk ns-272.awsdns-34.com ns-896.awsdns-48.net
Origin ASNAS16509 AWS (AS16509)
BGP prefix143.204.160.0/21

HTTP

GET / status301
/cdn-cgi/tracenot probed
cf-raya4c032279eb9065f-SEA
locationhttps://help.duo.com/
servercloudflare
via1.1 5af99d6f2fc1c569c253259aec683ee8.cloudfront.net (CloudFront)
x-amz-cf-id8AKNGfuwSAiKEVNf4UgwNpZY2qWLNTSjPk8JTvOWQ2ER6BJb2OzsSA==
x-amz-cf-popSEA900-P9
x-cacheHit from cloudfront

Why we classified it this way

DNS

  • AWS Route 53 AWS Route 53 · NS ns-1271.awsdns-30.org, ns-1600.awsdns-08.co.uk, ns-272.awsdns-34.com, ns-896.awsdns-48.net (confidence 95%)

Edge

  • AWS AWS CloudFront (IP range) · A 143.204.160.105 in published aws_cloudfront ranges; x-amz-cf-* / via CloudFront (confidence 93%)

History

ScanStatusDNSEdgeCNAME / AASN
2026-10-17liveAWS Route 53AWS143.204.160.105 143.204.160.55 143.204.160.114 143.204.160.40AS16509
2026-10-17liveAWS Route 53AWS143.204.160.40 143.204.160.114 143.204.160.105 143.204.160.55AS16509