Validexpires in 58d
Certificate
Issuer (CA)YR1↗Let's Encrypt⌕ reverse certs from this CA →
Subject (CN)classroom.github.com
ValidityAug 4 14:09:47 2026 GMT→Nov 2 14:09:46 2026 GMT· 58 d left
ValidationDV
Serial0698C9BCA2FFE3E738182ACF6FC12512F1BD
KeyRSA · 4096-bit
SignatureSHA-256 with RSA
Fingerprint (SHA-256)1bef3545d53765af92bf7b0bb605dc0dc0875858755dd2b3f98ed62655b02412
SAN domains — covered by this certificate
classroom.github.com↗⌕ reverse by SAN →
Certificate Transparency (crt.sh)
Certificate Transparency logs unavailable right now (crt.sh).
Security (TLS)
ProtocolTLSv1.3
CipherTLS_AES_128_GCM_SHA256
HTTP protocolsHTTP/1.1HTTP/2HTTP/3
HSTSnot setno Strict-Transport-Security header
Chain
leafclassroom.github.com← YR1
intermediateYR1← Root YR
intermediateRoot YR← ISRG Root X1
rootISRG Root X1
Same certificate — neighbour domains
No other domains share this certificate in our graph yet — this grows as domains are scanned.
host: classroom.github.comcollected 2 d ago · stale, refreshing…↻ Refresh