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 oss-ab.net

Valid
Issued by (CA)
GlobalSign nv-sa
Subject
*.oss-ab.net
Valid from
Nov 25, 2025
Valid until
Dec 27, 2026 (46 days remaining)
Public key
RSA 4096-bit
Serial
1D6FBD15E8BFA288A313A640
SHA-256 fingerprint
58:8D:29:A9:76:D9:CD:B9:14:CE:9C:0E:C4:58:0D:4A:AE:72:78:80:DD:09:2C:24:6B:95:B3:1A:E4:60:AF:13
Chain
GlobalSign GCC R3 DV TLS CA 2020 → GlobalSign
Subject Alternative Names (5)
*.oss-ab.net, autodiscover.oss-ab.net, mail.oss-ab.net, oss-ab.net, owa.oss-ab.net

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 Nov 5, 2026.

Never get surprised by oss-ab.net's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch oss-ab.net 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.