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w3schools.com

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

Security headers: B 83/100 (rank #114 of 461) · TLS: TLSv1.2 · Cert expires in 119 days (rank #347 of 459 soonest) · Response: 1050.3 ms (rank #410 of 446)
Certificate valid for 119 more days (until Feb 28 23:59:59 2027 GMT).

TLS certificate

FieldValue
IssuerAmazon
Subject CNw3schools.com
Valid untilFeb 28 23:59:59 2027 GMT
Days left119
TLS versionTLSv1.2
SAN entries1

Security headers (83/100, grade B)

HeaderStatus
strict-transport-securitymax-age=31536000
content-security-policyframe-ancestors 'self' https://mycourses.w3schools.com https://pathfinder.w3schools.com; u
x-content-type-optionsnosniff
referrer-policystrict-origin-when-cross-origin
permissions-policycamera=(), microphone=(), geolocation=(self)
x-frame-optionsmissing

Availability & performance

FieldValue
Availability100% (3/3 probes)
Avg response1050.3 ms
Fastest / slowest1006.5 / 1080.3 ms
HTTP status200 (https)
Servern/a

DNS & robots.txt

FieldValue
A records13.248.240.135, 76.223.115.82
Nameserversns-1409.awsdns-48.org, ns-1939.awsdns-50.co.uk, ns-314.awsdns-39.com, ns-769.awsdns-32.net
MX records6
robots.txtpresent (1 sitemap refs, 5 disallow rules)

How w3schools.com 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
freecodecamp.orgB8372430.0

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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.