SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
uni-bonn.de
SSL/TLS Certificate
SSL/TLS Certificate for uni-bonn.de
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- uni-bonn.de
- Valid from
- Jul 12, 2026
- Valid until
- Oct 10, 2026 (78 days remaining)
- Public key
- EC 384-bit
- Serial
- 05D0954E7F484174941B81484B78A5930862
- SHA-256 fingerprint
- D2:95:61:37:00:A2:50:EA:68:4A:12:C8:3A:F3:37:21:25:B9:D6:B5:01:A9:18:28:DC:8F:EF:42:B2:AE:FD:42
- Chain
- YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (harica.gr, letsencrypt.org, pki.dfn.de, sectigo.com).
Never get surprised by uni-bonn.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch uni-bonn.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, 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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