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 uni-duesseldorf.de

Valid
Issued by (CA)
Hellenic Academic and Research Institutions CA
Subject
hhu.de
Valid from
Jan 21, 2026
Valid until
Jan 21, 2027 (182 days remaining)
Public key
EC 256-bit
Serial
03EFABA88BFF31AF12BCCA78B590CB4C
SHA-256 fingerprint
21:F6:C6:CB:FD:0A:CE:E6:2C:7E:10:F8:F2:92:0E:96:A8:8C:56:CC:00:93:4F:08:A9:9C:C2:03:A3:11:C4:0B
Chain
GEANT TLS ECC 1 → HARICA TLS ECC Root CA 2021 → Hellenic Academic and Research Institutions ECC RootCA 2015
Subject Alternative Names (70)
buergeruni.hhu.de, cedus.hhu.de, colab.hhu.de, diid.hhu.de, diversity.hhu.de, elearning.hhu.de, forschung.hhu.de, forschung.uni-duesseldorf.de, gffu.hhu.de, haus-der-universitaet.hhu.de, hcsd.hhu.de, hdu.hhu.de, heine-slam.hhu.de, hera.hhu.de, hhu.de, igrad.hhu.de, juno.hhu.de, mentoring.hhu.de, mittelbauvertretung.hhu.de, pr-niwi.hhu.de, profil.hhu.de, prwiss.hhu.de, rz.uni-duesseldorf.de, sbv.hhu.de, science-fight.hhu.de, sell.hhu.de, shk-rat.hhu.de, smm.hhu.de, spz.hhu.de, studienstart.hhu.de, studierendenakademie.hhu.de, uni-duesseldorf.de, unichor.hhu.de, uniorchester.hhu.de, www.buergeruni.hhu.de, www.cedus.hhu.de, www.colab.hhu.de, www.diid.hhu.de, www.diversity.hhu.de, www.elearning.hhu.de, www.forschung.hhu.de, www.forschung.uni-duesseldorf.de, www.gffu.hhu.de, www.haus-der-universitaet.hhu.de, www.hcsd.hhu.de, www.hdu.hhu.de, www.heine-slam.hhu.de, www.hera.hhu.de, www.hhu.de, www.igrad.hhu.de, www.juno.hhu.de, www.mentoring.hhu.de, www.mittelbauvertretung.hhu.de, www.pr-niwi.hhu.de, www.profil.hhu.de, www.prwiss.hhu.de, www.rz.uni-duesseldorf.de, www.sbv.hhu.de, www.science-fight.hhu.de, www.sell.hhu.de, www.shk-rat.hhu.de, www.smm.hhu.de, www.spz.hhu.de, www.studienstart.hhu.de, www.studierendenakademie.hhu.de, www.uni-duesseldorf.de, www.unichor.hhu.de, www.uniorchester.hhu.de, www.zsu.hhu.de, zsu.hhu.de

Certificate Authority Authorization (CAA)

CAA restricts issuance to harica.gr, pki.dfn.de, sectigo.com, telesec.de; we couldn't map the serving CA (Hellenic Academic and Research Institutions CA) to one of these identifiers.

Never get surprised by uni-duesseldorf.de's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch uni-duesseldorf.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.

Monitor this certificate free

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