TLS 1.3 TLS_AES_128_GCM_SHA256
Leaf Certificate
Subject mastodon.social
Issuer YR1
Valid From Jul 17, 2026
Valid Until Oct 15, 2026 (59 days)
Algorithm SHA256-RSA
Subject Alternative Names
files.mastodon.socialmastodon.socialwww.mastodon.social
Intermediate
Subject YR1
Issuer Root YR
Valid From Sep 3, 2025
Valid Until Sep 2, 2028 (748 days)
Algorithm SHA256-RSA
Intermediate
Subject Root YR
Issuer ISRG Root X1
Valid From May 13, 2026
Valid Until Sep 2, 2032 (2209 days)
Algorithm SHA256-RSA
Findings
✓ TLS 1.3 supported
✓ SSL certificate valid (59 days remaining)
✓ Certificate covers 3 domains (SANs)
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