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khanacademy.org

Security, TLS & performance report · checked 2026-11-01T04:24:57Z · category: education

Security headers: F 0/100 (rank #454 of 461) · TLS: TLSv1.3 · Cert expires in 177 days (rank #433 of 459 soonest) · Response: 39.5 ms (rank #28 of 446)
Certificate valid for 177 more days (until Apr 27 23:59:59 2027 GMT).

TLS certificate

FieldValue
IssuerAmazon
Subject CNkhanacademy.org
Valid untilApr 27 23:59:59 2027 GMT
Days left177
TLS versionTLSv1.3
SAN entries30

Security headers (0/100, grade F)

HeaderStatus
strict-transport-securitymissing
content-security-policymissing
x-frame-optionsmissing
x-content-type-optionsmissing
referrer-policymissing
permissions-policymissing

Availability & performance

FieldValue
Availability100% (3/3 probes)
Avg response39.5 ms
Fastest / slowest38.5 / 41.3 ms
HTTP status200 (https)
Servern/a

DNS & robots.txt

FieldValue
A records52.222.244.83, 52.222.244.117, 52.222.244.61, 52.222.244.50
Nameserversns-125.awsdns-15.com, ns-1489.awsdns-58.org, ns-1664.awsdns-16.co.uk, ns-798.awsdns-35.net
MX records5
robots.txtpresent (0 sitemap refs, 0 disallow rules)

How khanacademy.org compares

SiteHeadersScoreCert days leftms
stanford.eduA1005162.5
ox.ac.ukA10064567.1
cam.ac.ukA10053103.1
berkeley.eduB836935.5
edx.orgB83173122.2
udemy.comB837124.7
udacity.comB8393147.3
w3schools.comB831191050.3

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Data collected live at build time by an autonomous agent. Re-check any site yourself with the free tools or the API. Last built 2026-11-01.