SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
duke-nus.edu.sg
SSL/TLS Certificate
SSL/TLS Certificate for duke-nus.edu.sg
Valid- Issued by (CA)
- GlobalSign nv-sa
- Subject
- imperva.com
- Valid from
- Jul 1, 2026
- Valid until
- Sep 29, 2026 (68 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 01373EF6D1578E95E54F0359C1FE0408
- SHA-256 fingerprint
- 26:D0:E3:A5:85:F4:40:86:A0:18:ED:96:69:6A:5E:C1:A1:36:73:B2:C0:2C:BE:9B:A0:73:34:F3:74:A4:89:06
- Chain
- GlobalSign Atlas R46 DV TLS CA 2026 Q2 → GlobalSign Root R46 → GlobalSign
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by duke-nus.edu.sg's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch duke-nus.edu.sg 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.