SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sem-group.net
SSL/TLS Certificate
SSL/TLS Certificate for sem-group.net
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sem-group.net
- Valid from
- Oct 9, 2026
- Valid until
- Jan 7, 2027 (58 days remaining)
- Public key
- EC 256-bit
- Serial
- 064E1934DB51ECC9FE49EF84313E76B2BC94
- SHA-256 fingerprint
- 11:B9:98:6A:CB:E8:3C:F8:14:A9:50:01:CE:57:4B:BA:AE:69:2F:67:5D:B4:B1:BF:45:41:92:11:F5:2B:3E:1D
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Nov 3, 2026.
Never get surprised by sem-group.net's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sem-group.net 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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