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blog.duosecurity.com

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

AWS Route 53DNS (zone duosecurity.com)
AWSEdge
AWS (AS16509)99.86.96.0/21

DNS records

Statuslive
CNAME chain—
A99.86.101.11 99.86.101.14 99.86.101.49 99.86.101.59
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 prefix99.86.96.0/21

HTTP

GET / status301
/cdn-cgi/tracenot probed
cf-raya4c0320bf95a065f-SEA
locationhttps://duo.com/blog/
servercloudflare
via1.1 d3bfe98e429816f5ef9a7f33a86a739a.cloudfront.net (CloudFront)
x-amz-cf-id9XZljHyBj_ZIVi7eFsPs0x2rXCyxjn9rJHV62Hr3SpwaDmU0OQtAJQ==
x-amz-cf-popSEA900-P13
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 99.86.101.11 in published aws_cloudfront ranges; x-amz-cf-* / via CloudFront (confidence 93%)

History

ScanStatusDNSEdgeCNAME / AASN
2026-10-17liveAWS Route 53AWS99.86.101.11 99.86.101.14 99.86.101.49 99.86.101.59AS16509
2026-10-17liveAWS Route 53AWS99.86.101.14 99.86.101.11 99.86.101.59 99.86.101.49AS16509