SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
freifunk-frankfurt.de
SSL/TLS Certificate
SSL/TLS Certificate for freifunk-frankfurt.de
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- donate.ffffm.net
- Valid from
- Apr 29, 2026
- Valid until
- Jul 28, 2026 (7 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 05C1B0C15F6D3325337D2A1A3A211080E529
- SHA-256 fingerprint
- 01:40:5D:42:1B:7C:71:E3:94:D7:E2:A6:22:EF:08:C0:1E:5B:8A:0D:F2:76:46:53:A8:EF:35:AE:3C:AF:E9:56
- Chain
- R13 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).