SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ec2-43-200-237-145.ap-northeast-2.compute.amazonaws.com
SSL/TLS Certificate
SSL/TLS Certificate for ec2-43-200-237-145.ap-northeast-2.compute.amazonaws.com
Expired- Issued by (CA)
- Let's Encrypt
- Subject
- cu1000.co.kr
- Valid from
- Jul 29, 2026
- Valid until
- Oct 27, 2026 (expired 11 days ago)
- Public key
- RSA 2048-bit
- Serial
- 069BD685809EF6D5EC6B491033AFE9CC412F
- SHA-256 fingerprint
- 2A:5D:FA:93:C8:D1:1F:4B:76:92:B8:60:CF:6B:73:24:76:AB:4E:8C:71:45:A8:77:F8:BC:27:D5:CB:A7:56:C8
- 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 ec2-43-200-237-145.ap-northeast-2.compute.amazonaws.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch ec2-43-200-237-145.ap-northeast-2.compute.amazonaws.com 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.