SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ec2-18-180-203-238.ap-northeast-1.compute.amazonaws.com
SSL/TLS Certificate
SSL/TLS Certificate for ec2-18-180-203-238.ap-northeast-1.compute.amazonaws.com
Hostname mismatch- Issued by (CA)
- Starfield Technologies, Inc.
- Subject
- *.ufinity.jp
- Valid from
- Sep 2, 2025
- Valid until
- Sep 20, 2026 (32 days remaining)
- Public key
- RSA 2048-bit
- Serial
- C33F8D9B15C0B64F
- SHA-256 fingerprint
- F9:9E:A1:35:82:5D:21:D8:E9:52:22:4A:3E:02:38:AB:B1:4C:01:AA:C4:B4:12:EF:F9:14:7D:BD:24:A1:FC:F9
- Chain
- Starfield Secure Certificate Authority - G2 → Starfield Root Certificate Authority - G2
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by ec2-18-180-203-238.ap-northeast-1.compute.amazonaws.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch ec2-18-180-203-238.ap-northeast-1.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, 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.