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 bon.se

Expiring soon
Issued by (CA)
Certainly
Subject
bon.se
Valid from
Sep 24, 2026
Valid until
Oct 24, 2026 (20 days remaining)
Public key
RSA 2048-bit
Serial
78741EE1A685940E71EE5E7D0057A6A41A41
SHA-256 fingerprint
1B:CB:23:6A:53:42:40:DE:4E:5A:9E:7A:08:A3:62:B6:8E:32:24:0C:36:4E:3E:2B:45:EC:9C:B3:EF:27:D4:D3
Chain
Certainly Intermediate R1 → Starfield Root Certificate Authority - G2
Subject Alternative Names (1)
bon.se

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 2, 2026.

Never get surprised by bon.se's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch bon.se 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.