SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
open-it.hu
SSL/TLS Certificate
SSL/TLS Certificate for open-it.hu
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- open-it.hu
- Valid from
- Aug 13, 2026
- Valid until
- Nov 11, 2026 (42 days remaining)
- Public key
- EC 256-bit
- Serial
- 050941D1185B35172BE9223ACAD253703321
- SHA-256 fingerprint
- 27:59:A4:CE:6A:44:6B:9E:D6:A3:41:CF:B9:20:CE:E3:BD:8B:8E:30:30:B7:4E:29:40:4D:36:57:2F:A8:3C:EB
- Chain
- YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
We've observed 1 previous certificate for this host. This certificate has been served since Sep 21, 2026.
Never get surprised by open-it.hu's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch open-it.hu 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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