SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
komaba-oh.jp
SSL/TLS Certificate
SSL/TLS Certificate for komaba-oh.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.komaba-oh.jp
- Valid from
- Sep 29, 2026
- Valid until
- Dec 28, 2026 (55 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06748A53B172F7FA3CF18C98E33F1FBCC9A3
- SHA-256 fingerprint
- 4B:0C:50:CC:16:85:77:CE:93:84:AA:DC:BF:7A:9C:BF:1C:0D:A3:C3:3B:16:3B:89:A9:E6:71:B0:10:D6:DE:C8
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by komaba-oh.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch komaba-oh.jp 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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