SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
cityplan-verlag.de
SSL/TLS Certificate
SSL/TLS Certificate for cityplan-verlag.de
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- www.cityplan-verlag.de
- Valid from
- Aug 14, 2026
- Valid until
- Nov 12, 2026 (65 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06F6449A5E9ED1256DE3F0FB89973AF967C2
- SHA-256 fingerprint
- A2:B0:4F:A8:E4:A8:1A:F1:07:6F:5E:B2:FE:D9:EC:2B:37:45:83:D5:FF:EE:DF:44:0C:DA:EE:2F:5A:4F:9A:58
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
We've observed 1 previous certificate for this host. This certificate has been served since Sep 4, 2026.
Never get surprised by cityplan-verlag.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch cityplan-verlag.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.