SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

SSL/TLS Certificate for bad-dev.sk

Valid
Issued by (CA)
Let's Encrypt
Subject
bad-dev.sk
Valid from
Aug 7, 2026
Valid until
Nov 5, 2026 (51 days remaining)
Public key
RSA 4096-bit
Serial
05B93A660F3CCEDC1282382D24BE5178F563
SHA-256 fingerprint
36:D2:A9:83:CB:88:34:D2:9B:5D:99:2B:AC:D7:3E:79:A4:C5:4E:0A:74:D3:C1:06:01:6A:C4:C8:C6:4F:3B:FE
Chain
YR1 → Root YR → ISRG Root X1
Subject Alternative Names (2)
*.bad-dev.sk, bad-dev.sk

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 29, 2026.

Never get surprised by bad-dev.sk's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch bad-dev.sk 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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.