SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
umwerk-domains.com
SSL/TLS Certificate
SSL/TLS Certificate for umwerk-domains.com
Expired- Issued by (CA)
- Let's Encrypt
- Subject
- umwerk.net
- Valid from
- Apr 15, 2025
- Valid until
- Jul 14, 2025 (expired 440 days ago)
- Public key
- EC 384-bit
- Serial
- 059263A573B36C17FDA685C9E1640E9F2282
- SHA-256 fingerprint
- 1A:30:4F:B8:EE:D2:79:02:D8:88:12:BB:72:DC:87:89:5A:2F:9F:8A:85:64:08:12:9D:2F:4F:9D:1A:0B:A0:5F
- Chain
- E6 → 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 Sep 11, 2026.
Never get surprised by umwerk-domains.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch umwerk-domains.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.