SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
gem-k.co.kr
SSL/TLS Certificate
SSL/TLS Certificate for gem-k.co.kr
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- gem-k.co.kr
- Valid from
- Sep 25, 2026
- Valid until
- Dec 24, 2026 (44 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06A71A996B35BA3E9CC71165345A3D4953E7
- SHA-256 fingerprint
- 6D:7B:A2:89:25:44:EB:4F:BA:19:B1:00:B9:01:5E:1C:A5:A1:8D:76:69:E2:F2:45:E1:13:49:0F:E3:5C:29:53
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Oct 29, 2026.
Never get surprised by gem-k.co.kr's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch gem-k.co.kr continuously, notifying you the moment anything moves across all three signals:
Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, CNAME, TXT and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
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