~/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 60 more days.

── output ─────

Issued to: *.vercel.com
Issued by: R12
Valid from: 2026-03-23
Valid until: 2026-06-21 (60 days)
TLS version: TLSv1.3
Cipher: TLS_AES_128_GCM_SHA256
Key: RSA · 2048 bit
Signature: sha256WithRSAEncryption
Forward secrecy: yes
Self-signed: no
Must-staple: no
SHA-256 fingerprint: CD:BF:F9:BD:76:1F:22:83:E7:BF:C2:7D:BD:C0:05:81:4D:5C:1F:45:B6:B0:6A:10:B7:1D:47:CC:93:CA:08:68
Serial: 0501155551D55FC3DBFDE01C76D6485CBE12

subject_alt_names · 2

*.vercel.com vercel.com

certificate_chain · 2 certs

[ leaf ]*.vercel.com

60 days left

issuer: R12

2026-03-23 → 2026-06-21

[ inter ]R12

325 days left

issuer: ISRG Root X1

2024-03-13 → 2027-03-12

// Save vercel.com → we'll run this daily and alert on changes. /signup →