~/tools / ssl-checker

SSL Checker

Check SSL certificate expiry, chain validity, TLS version and cipher. Catches expired certs, weak crypto and chain issues.

>
[ OK ] Valid for 38 more days.
── output ─────
Issued to
www.argos.co.uk
Issued by
Sectigo RSA Organization Validation Secure Server CA
Valid from
2025-05-29
Valid until
2026-05-29 (38 days)
TLS version
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384
Key
RSA · 2048 bit
Signature
sha256WithRSAEncryption
Forward secrecy
yes
Self-signed
no
Must-staple
no
SHA-256 fingerprint
0A:34:BB:75:86:6B:B0:5D:F3:19:91:A6:97:7C:F5:18:F6:53:11:04:BE:BD:CA:F3:61:CD:96:9F:FD:30:96:22
Serial
DACED20A08DA6008151C6090791CEC7D
subject_alt_names · 10
www.argos.co.uk api-v4.argos.co.uk api.argos.co.uk argos.co.uk bolt.argos.co.uk chat.argos.co.uk labs.argos.co.uk m.argos.co.uk tu.argos.co.uk youtube.argos.co.uk
certificate_chain · 4 certs
[ leaf ]www.argos.co.uk
38 days left
issuer: Sectigo RSA Organization Validation Secure Server CA
2025-05-29 → 2026-05-29
[ inter ]Sectigo RSA Organization Validation Secure Server CA
1715 days left
issuer: USERTrust RSA Certification Authority
2018-11-02 → 2030-12-31
[ inter ]USERTrust RSA Certification Authority
985 days left
issuer: AAA Certificate Services
2019-03-12 → 2028-12-31
[ root ]AAA Certificate Services
985 days left
issuer: AAA Certificate Services
2004-01-01 → 2028-12-31
// Save argos.co.uk → we'll run this daily and alert on changes. /signup →