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-immo.at

Valid
Issued by (CA)
Let's Encrypt
Subject
www.a-immo.at
Valid from
Jun 23, 2026
Valid until
Sep 21, 2026 (41 days remaining)
Public key
RSA 2048-bit
Serial
05F9FDDE5D2B58209952D6A526E1381FF711
SHA-256 fingerprint
ED:D6:57:9C:2E:1C:6C:91:7C:53:12:93:41:87:19:79:AA:B4:1C:F0:D3:E3:3C:7D:D7:2C:20:40:98:87:17:D2
Chain
YR1 → Root YR → ISRG Root X1
Subject Alternative Names (2)
a-immo.at, www.a-immo.at

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 Aug 3, 2026.

Never get surprised by a-immo.at's certificate expiring

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