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Certificate audit

rule.school SSL certificate check

SEO page with a cached certificate, TLS and chain-of-trust inspection result.

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SSL certificate

Validity

Valid

Days remaining

31

Chain status

Trusted chain

Issuer

CN=YR1,O=Let's Encrypt,C=US

Subject

CN=rule.school

Valid from

6/13/2026 12:03:44 AM

Valid until

9/11/2026 12:03:43 AM

TLS version

TLS 1.2

Cipher

TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

Subject alternative names

rule.schoolwww.rule.school

Certificate chain

Certificate 1 /leaf

rule.school

Issuer: CN=YR1,O=Let's Encrypt,C=US

Until: 9/11/2026 12:03:43 AMCA: falseSelf-signed: false

Certificate 2 /intermediate

YR1

Issuer: CN=Root YR,O=ISRG,C=US

Until: 9/2/2028 11:59:59 PMCA: trueSelf-signed: false

Certificate 3 /last-presented

Root YR

Issuer: CN=ISRG Root X1,O=Internet Security Research Group,C=US

Until: 9/2/2032 11:59:59 PMCA: trueSelf-signed: false

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