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 a-flensborg.dk

Valid
Issued by (CA)
Let's Encrypt
Subject
a-flensborg.dk
Valid from
Jul 15, 2026
Valid until
Oct 13, 2026 (30 days remaining)
Public key
RSA 2048-bit
Serial
05AB509330D78E548B6FC70CDB245D44203D
SHA-256 fingerprint
8C:B5:29:55:E7:3D:92:60:CC:E3:8E:9A:99:0A:BC:3F:F7:FF:EC:95:A6:49:F6:85:C0:72:D4:30:E2:CA:64:04
Chain
YR2 → Root YR → ISRG Root X1
Subject Alternative Names (2)
a-flensborg.dk, www.a-flensborg.dk

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 5, 2026.

Never get surprised by a-flensborg.dk's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch a-flensborg.dk 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.