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w3.org

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

Security headers: C 50/100 (rank #274 of 461) · TLS: TLSv1.3 · Cert expires in 34 days (rank #39 of 459 soonest) · Response: 97.9 ms (rank #116 of 446)
Certificate valid for 34 more days (until Dec 5 04:37:32 2026 GMT).

TLS certificate

FieldValue
IssuerGoogle Trust Services
Subject CNw3.org
Valid untilDec 5 04:37:32 2026 GMT
Days left34
TLS versionTLSv1.3
SAN entries2

Security headers (50/100, grade C)

HeaderStatus
strict-transport-securitymax-age=15552000; includeSubdomains; preload
content-security-policyframe-ancestors 'self' https://cms.w3.org/ https://cms-dev.w3.org/; upgrade-insecure-reque
x-content-type-optionsnosniff
x-frame-optionsmissing
referrer-policymissing
permissions-policymissing

Availability & performance

FieldValue
Availability100% (3/3 probes)
Avg response97.9 ms
Fastest / slowest78.0 / 129.1 ms
HTTP status200 (https)
Servercloudflare

DNS & robots.txt

FieldValue
A records104.18.22.19, 104.18.23.19
Nameserversjamie.ns.cloudflare.com, pranab.ns.cloudflare.com
MX records2
robots.txtpresent (0 sitemap refs, 113 disallow rules)

How w3.org compares

SiteHeadersScoreCert days leftms
speedtest.netA100161175.3
mozilla.orgB8342106.1
iana.orgB836564.9
whatismyipaddress.comB834534.2
archive.orgC5010073.3
ietf.orgC507998.1
ipinfo.ioC5088136.5
gravatar.comC5065200.8

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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.