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 compsci-math.cz

Valid
Issued by (CA)
Hellenic Academic and Research Institutions CA
Subject
www.mff.cuni.cz
Valid from
Jul 23, 2026
Valid until
Feb 7, 2027 (156 days remaining)
Public key
RSA 2048-bit
Serial
07406843B9A166F07B5969AE5174547D
SHA-256 fingerprint
1C:B5:85:D1:51:70:C0:D8:0A:A1:B1:2D:4F:CF:4E:C2:A4:1A:E7:8E:49:39:7B:DE:87:35:92:20:40:90:FD:16
Chain
GEANT TLS RSA 1 → HARICA TLS RSA Root CA 2021 → Hellenic Academic and Research Institutions RootCA 2015
Subject Alternative Names (77)
albertus.cz, alumni-dev.karlov.mff.cuni.cz, alumni.karlov.mff.cuni.cz, amoeba.mff.cuni.cz, biophysics.mff.cuni.cz, compsci-math.cz, cs.mff.cuni.cz, denfirem-dev.karlov.mff.cuni.cz, denfirem.karlov.mff.cuni.cz, devweb.karlov.mff.cuni.cz, dnyfirem.matfyz.cz, elvis.mff.cuni.cz, essredir.karlov.mff.cuni.cz, feat.matfyz.cz, fu.mff.cuni.cz, fuuk.mff.cuni.cz, is.mff.cuni.cz, ispa-dev.karlov.mff.cuni.cz, ispa.karlov.mff.cuni.cz, kfa.mff.cuni.cz, kfkl.mff.cuni.cz, kfnt.mff.cuni.cz, kfpp.mff.cuni.cz, lists.karlov.mff.cuni.cz, lists.matfyz.cuni.cz, lkod.mff.cuni.cz, man.karlov.mff.cuni.cz, matfyz-alumni.cz, matfyz-dev.karlov.mff.cuni.cz, matfyz.cuni.cz, matfyz.cz, matfyz.karlov.mff.cuni.cz, matfyzalumni.cz, matfyzfeat.mff.cuni.cz, math-compsci.cz, mff.cuni.cz, mgml.eu, mgml.karlov.mff.cuni.cz, physics.mff.cuni.cz, plague.karlov.mff.cuni.cz, plague.mff.cuni.cz, psik.karlov.mff.cuni.cz, psik.mff.cuni.cz, sbredir.karlov.mff.cuni.cz, science-on-stage.cz, scienceonstage.cz, search.mff.cuni.cz, sisal.mff.cuni.cz, skas.mff.cuni.cz, sons2022.cz, sons2022.eu, spl-msb.mff.cuni.cz, studuj-matfyz.cz, studuj2.karlov.mff.cuni.cz, studuj3.karlov.mff.cuni.cz, studujmatfyz.cz, utf.mff.cuni.cz, video.mff.cuni.cz, webmailer.karlov.mff.cuni.cz, webmailer.mff.cuni.cz, www.albertus.cz, www.compsci-math.cz, www.karlov.mff.cuni.cz, www.kfnt.mff.cuni.cz, www.ktiml.mff.cuni.cz, www.matfyz-alumni.cz, www.matfyz.cz, www.matfyzalumni.cz, www.math-compsci.cz, www.mff.cuni.cz, www.mgml.eu, www.science-on-stage.cz, www.scienceonstage.cz, www.sons2022.cz, www.sons2022.eu, www.studuj-matfyz.cz, www.studujmatfyz.cz

Certificate Authority Authorization (CAA)

CAA restricts issuance to harica.gr; we couldn't map the serving CA (Hellenic Academic and Research Institutions CA) to one of these identifiers.

This certificate has been served since Aug 15, 2026.

Never get surprised by compsci-math.cz's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch compsci-math.cz 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.