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 celeritas.sk

Hostname mismatch
Issued by (CA)
Let's Encrypt
Subject
*.netspace.sk
Valid from
Aug 31, 2026
Valid until
Nov 29, 2026 (42 days remaining)
Public key
EC 256-bit
Serial
0641BB4DB7F12C80F4D7C13995DC294E2C50
SHA-256 fingerprint
C6:4C:42:53:55:AF:8D:66:BE:99:D0:50:1B:45:7A:7B:5C:E8:2A:D9:ED:21:23:62:8E:D9:B2:73:CA:D4:20:D8
Chain
YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Subject Alternative Names (2)
*.netspace.sk, netspace.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 Oct 16, 2026.

Never get surprised by celeritas.sk's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch celeritas.sk continuously, notifying you the moment anything moves across all three signals:

Certificate monitor showing the issuer, expiry date, chain status, fingerprint, covered names, and a history of a rotation and an expiry warning

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, CNAME, TXT 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.