SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

ec2-18-178-142-100.ap-northeast-1.compute.amazonaws.com

SSL/TLS Certificate

SSL/TLS Certificate for ec2-18-178-142-100.ap-northeast-1.compute.amazonaws.com

Hostname mismatch
Issued by (CA)
Amazon
Subject
leafnet.jp
Valid from
Jan 14, 2026
Valid until
Feb 12, 2027 (202 days remaining)
Public key
EC 256-bit
Serial
07CB2F52EF661AFEC86739293A4DC506
SHA-256 fingerprint
01:17:FB:A6:58:4A:43:7F:4D:3F:A2:CA:CC:D1:48:93:63:B2:43:6E:5B:47:40:82:15:0B:AE:7E:0A:47:0E:78
Chain
Amazon ECDSA 256 M01 → Amazon Root CA 3 → Starfield Services Root Certificate Authority - G2
Subject Alternative Names (2)
*.leafnet.jp, leafnet.jp

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.

Never get surprised by ec2-18-178-142-100.ap-northeast-1.compute.amazonaws.com's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch ec2-18-178-142-100.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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.