SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
opta-berlin.com
SSL/TLS Certificate
SSL/TLS Certificate for opta-berlin.com
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- opta-berlin.com
- Valid from
- Jul 7, 2026
- Valid until
- Oct 5, 2026 (74 days remaining)
- Public key
- EC 384-bit
- Serial
- 0552A9D00860D692B18BE6F76F8F0B8EA3B8
- SHA-256 fingerprint
- 81:AF:31:7A:B3:51:EB:44:66:DB:78:71:85:15:0B:D3:9B:8B:D5:56:A6:29:BE:63:EB:05:61:F4:33:2B:6E:19
- Chain
- YE2 → Root YE → ISRG Root X2 → 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 opta-berlin.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch opta-berlin.com 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, DNSSEC, CNAME 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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