SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
open-xchange.co.uk
SSL/TLS Certificate
SSL/TLS Certificate for open-xchange.co.uk
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- *.open-xchange.co.uk
- Valid from
- Jun 8, 2026
- Valid until
- Sep 6, 2026 (38 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 066118FD86AC7AD68D0E75AF029715AF996E
- SHA-256 fingerprint
- F5:B0:6A:27:23:20:74:F6:03:D1:F6:56:04:04:33:99:77:CF:A7:43:D8:9A:71:BF:EC:D8:4A:9A:2B:4A:58:41
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by open-xchange.co.uk's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch open-xchange.co.uk 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.
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