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codepen.io

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

Security headers: A 100/100 (rank #2 of 461) · TLS: TLSv1.3 · Cert expires in 38 days (rank #50 of 459 soonest) · Response: 35.2 ms (rank #20 of 446)
Certificate valid for 38 more days (until Dec 10 04:00:21 2026 GMT).

TLS certificate

FieldValue
IssuerGoogle Trust Services
Subject CNcodepen.io
Valid untilDec 10 04:00:21 2026 GMT
Days left38
TLS versionTLSv1.3
SAN entries2

Security headers (100/100, grade A)

HeaderStatus
strict-transport-securitymax-age=31536000; includeSubDomains; preload
content-security-policydefault-src 'none'; script-src 'nonce-oQ4S8DOEk1nH4XB7D2k5UO' 'unsafe-eval' https://challe
x-frame-optionsSAMEORIGIN
x-content-type-optionsnosniff
referrer-policysame-origin
permissions-policyaccelerometer=(),camera=(),clipboard-read=(),clipboard-write=(),geolocation=(),gyroscope=(
none missing 🎉

Availability & performance

FieldValue
Availability100% (3/3 probes)
Avg response35.2 ms
Fastest / slowest29.2 / 38.8 ms
HTTP status403 (https)
Servercloudflare

DNS & robots.txt

FieldValue
A records104.16.163.32, 104.16.147.32
Nameserversalbert.ns.cloudflare.com, kristin.ns.cloudflare.com
MX records5
robots.txtpresent (0 sitemap refs, 31 disallow rules)

How codepen.io compares

SiteHeadersScoreCert days leftms
replit.comA1003840.8
github.comB838766.8
stackoverflow.comB837155.0
bitbucket.orgC6752231.2
jsfiddle.netC6750181.4
codeberg.orgC5038486.2
sourcegraph.comD3338148.0
gitea.comD3347202.6

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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.