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 guusmeeuwis.nl

Self-signed
Issued by (CA)
s931.whserver.nl
Subject
s931.whserver.nl
Valid from
Nov 5, 2026
Valid until
Nov 5, 2027 (361 days remaining)
Public key
RSA 4096-bit
Serial
4F8FC517B0079186E35C31592DD61D4EF29CDD7F
SHA-256 fingerprint
19:E6:A6:2A:FA:6C:42:A1:85:CD:39:36:A4:EB:88:D0:49:72:0A:D4:9E:29:6B:DA:AB:82:5A:F8:50:4C:5C:D6
Chain
s931.whserver.nl

Certificate Authority Authorization (CAA)

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

This certificate has been served since Sep 30, 2026.

Never get surprised by guusmeeuwis.nl's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch guusmeeuwis.nl 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.