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 agmar-leszno.pl

Valid
Issued by (CA)
Let's Encrypt
Subject
agmar-leszno.pl
Valid from
Oct 3, 2026
Valid until
Jan 1, 2027 (86 days remaining)
Public key
RSA 4096-bit
Serial
06EE95B30DCC2E91AF07C9115606A9416D1F
SHA-256 fingerprint
73:A8:44:71:76:99:DC:5B:E2:25:93:A1:05:BE:22:65:02:C3:14:59:89:E2:02:D1:85:0E:60:64:C0:D9:82:5E
Chain
YR1 → Root YR → ISRG Root X1
Subject Alternative Names (2)
agmar-leszno.pl, www.agmar-leszno.pl

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 23, 2026.

Never get surprised by agmar-leszno.pl's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch agmar-leszno.pl 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.