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 nikoh-j.co.jp

Valid
Issued by (CA)
Japan Registry Services Co., Ltd.
Subject
nikoh-j.co.jp
Valid from
Oct 31, 2025
Valid until
Nov 30, 2026 (28 days remaining)
Public key
RSA 2048-bit
Serial
07A9C6137BC1AB9BA850207E880E1380
SHA-256 fingerprint
01:9B:26:65:51:21:78:AF:82:47:DF:FD:2A:28:B1:B0:16:58:D2:7A:99:E1:E2:1B:BF:25:6D:38:4A:BA:08:36
Chain
JPRS Domain Validation Authority - G4
Subject Alternative Names (2)
nikoh-j.co.jp, www.nikoh-j.co.jp

Certificate Authority Authorization (CAA)

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

Never get surprised by nikoh-j.co.jp's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch nikoh-j.co.jp continuously, notifying you the moment anything moves across all three signals:

Certificate monitor showing the issuer, expiry date, chain status, fingerprint, covered names, and a history of a rotation and an expiry warning

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.

Monitor this certificate free

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