SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
pro-act.edu.hk
SSL/TLS Certificate
SSL/TLS Certificate for pro-act.edu.hk
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- www.pro-act.edu.hk
- Valid from
- Oct 12, 2026
- Valid until
- Apr 28, 2027 (170 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 26B09B5FD33AB205F7D43C2F4EDCE047
- SHA-256 fingerprint
- 4E:4A:5A:EC:11:87:49:80:8C:36:E9:38:76:13:3D:FC:1B:C7:AE:E8:68:43:BB:19:62:72:82:E4:09:E7:32:E0
- Chain
- Sectigo Public Server Authentication CA OV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
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 Aug 21, 2026.
Never get surprised by pro-act.edu.hk's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch pro-act.edu.hk 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, 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.
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