SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
wsa-online.pl
SSL/TLS Certificate
SSL/TLS Certificate for wsa-online.pl
Valid- Issued by (CA)
- Asseco Data Systems S.A.
- Subject
- wsa-online.pl
- Valid from
- Jan 26, 2026
- Valid until
- Jan 26, 2027 (142 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 52CAC81320F94C30DAB54E2962858646
- SHA-256 fingerprint
- 03:91:AE:11:0C:2F:21:27:C2:92:56:1D:4B:F2:C0:D0:F1:52:01:0D:43:83:A4:79:7B:8D:E2:2A:1A:44:DA:95
- Chain
- Certum DV TLS G2 R39 CA → Certum Trusted Root CA
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 4, 2026.
Never get surprised by wsa-online.pl's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch wsa-online.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.