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man7.org

TLS 1.3 TLS_AES_128_GCM_SHA256
Leaf Certificate
Subject kerrisk.com
Issuer YR1
Valid From Jun 21, 2026
Valid Until Sep 19, 2026 (34 days)
Algorithm SHA256-RSA
Subject Alternative Names
kerrisk.comlinuxprogramminginterface.comlinuxsystemprogramming.comlinuxsystemsprogramming.comman7.orgmichaelkerrisk.comthelinuxprogramminginterface.comtrainingfromthefuture.comwww.kerrisk.comwww.linuxprogramminginterface.comwww.linuxsystemprogramming.comwww.linuxsystemsprogramming.comwww.man7.orgwww.michaelkerrisk.comwww.thelinuxprogramminginterface.comwww.trainingfromthefuture.com
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 (34 days remaining)
✓ Certificate covers 16 domains (SANs)

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Security Headers
CSP, HSTS, X-Frame-Options grade for this site
DNS Lookup
Query A, AAAA, MX, TXT, NS, CNAME, and SOA records with authoritative timing.
Redirect Checker
Trace the full HTTP redirect chain, flag loops, and surface mixed-content downgrades.

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