SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sig-erfurt.de
SSL/TLS Certificate
SSL/TLS Certificate for sig-erfurt.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sig-ulm.de
- Valid from
- Nov 9, 2026
- Valid until
- Feb 7, 2027 (85 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 05D648F8082D6A6F00C69090077153874DAE
- SHA-256 fingerprint
- 96:82:50:B0:71:98:C2:C5:41:14:42:B8:08:0A:37:4A:A8:05:2E:9F:B6:C0:4C:C4:0D:48:8E:D6:4E:E8:E4:11
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
We've observed 2 previous certificates for this host. This certificate has been served since Oct 17, 2026.
Never get surprised by sig-erfurt.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sig-erfurt.de 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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