SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sit-office.de
SSL/TLS Certificate
SSL/TLS Certificate for sit-office.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sit-office.de
- Valid from
- Aug 22, 2026
- Valid until
- Nov 20, 2026 (30 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05782A6A41EDE7BD35D581154E2E8E51A618
- SHA-256 fingerprint
- 5F:47:5C:D3:AB:48:40:C2:BB:10:AA:D2:64:B4:5F:7F:C9:87:D0:5D:80:1E:6B:26:21:8A:2D:FC:33:78:F2:59
- 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.
This certificate has been served since Aug 2, 2026.
Never get surprised by sit-office.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sit-office.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.