SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
osterkamp-gmbh.com
SSL/TLS Certificate
SSL/TLS Certificate for osterkamp-gmbh.com
Valid- Issued by (CA)
- ZeroSSL GmbH
- Subject
- osterkamp-gmbh.com
- Valid from
- Jul 24, 2026
- Valid until
- Oct 22, 2026 (79 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 486E4A7E6AAF984A22C00DF06BBE3EC9
- SHA-256 fingerprint
- 3D:01:3F:33:70:89:5B:6B:14:0C:5D:42:F3:1F:58:2E:27:5B:A0:CE:EC:D3:11:C0:7C:21:2F:3D:A1:19:87:0B
- Chain
- ZeroSSL RSA DV SSL CA 2 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
We've observed 1 previous certificate for this host. This certificate has been served since Jul 26, 2026.
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Uptime
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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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