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github.com

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

Security headers: B 83/100 (rank #34 of 461) · TLS: TLSv1.3 · Cert expires in 87 days (rank #279 of 459 soonest) · Response: 66.8 ms (rank #81 of 446)
Certificate valid for 87 more days (until Jan 27 23:59:59 2027 GMT).

TLS certificate

FieldValue
IssuerSectigo Limited
Subject CNgithub.com
Valid untilJan 27 23:59:59 2027 GMT
Days left87
TLS versionTLSv1.3
SAN entries2

Security headers (83/100, grade B)

HeaderStatus
strict-transport-securitymax-age=31536000; includeSubdomains; preload
content-security-policydefault-src 'none'; base-uri 'self'; child-src github.githubassets.com github.com/assets-c
x-frame-optionsdeny
x-content-type-optionsnosniff
referrer-policyorigin-when-cross-origin, strict-origin-when-cross-origin
permissions-policymissing

Availability & performance

FieldValue
Availability100% (3/3 probes)
Avg response66.8 ms
Fastest / slowest62.6 / 75.0 ms
HTTP status200 (https)
Servergithub.com

DNS & robots.txt

FieldValue
A records172.182.252.133
Nameserversdns1.p08.nsone.net, dns2.p08.nsone.net, dns3.p08.nsone.net, dns4.p08.nsone.net
MX records1
robots.txtpresent (1 sitemap refs, 495 disallow rules)

How github.com compares

SiteHeadersScoreCert days leftms
replit.comA1003840.8
codepen.ioA1003835.2
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.