SSL/TLS Certificate Lookup

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

SSL/TLS Certificate for blackjack.jp

Expired
Issued by (CA)
DigiCert Inc
Subject
tezukaosamu.net
Valid from
Mar 14, 2018
Valid until
Jun 13, 2019 (expired 2638 days ago)
Public key
RSA 2048-bit
Serial
0133C4299406332F74162FF92D488A8F
SHA-256 fingerprint
1E:53:AD:BE:0B:19:6D:D7:7A:6F:2B:E2:53:03:10:8E:3A:3E:E6:5D:F8:49:2D:72:B8:4C:DF:3E:3C:AB:C5:9E
Chain
GeoTrust RSA CA 2018 → DigiCert Global Root CA
Subject Alternative Names (2)
tezukaosamu.net, www.tezukaosamu.net

Certificate Authority Authorization (CAA)

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

Never get surprised by blackjack.jp's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch blackjack.jp 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.