SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
seong-jin.co.kr
SSL/TLS Certificate
SSL/TLS Certificate for seong-jin.co.kr
Self-signed- Issued by (CA)
- SomeOrganization
- Subject
- host-172-16-100-130
- Valid from
- May 7, 2025
- Valid until
- May 7, 2026 (expired 169 days ago)
- Public key
- RSA 2048-bit
- Serial
- 77F7
- SHA-256 fingerprint
- 6F:48:F4:7C:22:DE:B0:C5:A9:CF:09:07:9B:F7:5D:C0:A9:F0:DE:44:FF:D6:46:52:B2:38:9B:89:05:C5:7F:9C
- Chain
- —
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by seong-jin.co.kr's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch seong-jin.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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