TLS 1.3 TLS_AES_128_GCM_SHA256
Leaf Certificate
Subject proton.me
Issuer YR2
Valid From Jul 9, 2026
Valid Until Oct 7, 2026 (51 days)
Algorithm SHA256-RSA
Subject Alternative Names
*.pr.tn*.proton.me*.storage.proton.mepr.tnproton.me
Intermediate
Subject YR2
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 (51 days remaining)
✓ Certificate covers 5 domains (SANs)
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