SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
wai-sum.edu.hk
SSL/TLS Certificate
SSL/TLS Certificate for wai-sum.edu.hk
Valid- Issued by (CA)
- Google Trust Services
- Subject
- wai-sum.edu.hk
- Valid from
- Jul 2, 2026
- Valid until
- Sep 30, 2026 (45 days remaining)
- Public key
- RSA 2048-bit
- Serial
- F9A996F02034C223137E52AC6A45B061
- SHA-256 fingerprint
- 66:91:C8:59:E4:E3:04:87:15:48:2D:2F:11:71:D8:49:CF:D7:84:E9:0A:FE:E0:4D:F0:E7:31:76:06:BF:0C:E3
- Chain
- WR1 → GTS Root R1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by wai-sum.edu.hk's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch wai-sum.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, 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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