SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
esus-it.com
SSL/TLS Certificate
SSL/TLS Certificate for esus-it.com
Valid- Issued by (CA)
- Asseco Data Systems S.A.
- Subject
- *.esus-it.com
- Valid from
- Jan 13, 2026
- Valid until
- Jan 13, 2027 (99 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 3805040CCE333BB666CA8DDC0D8C0056
- SHA-256 fingerprint
- 4E:E2:F6:84:D6:A7:F7:85:0E:63:30:23:F8:D9:F7:CF:2A:0F:16:8F:9C:D0:88:43:7C:A0:82:19:AB:A5:AF:2B
- Chain
- Certum DV TLS G2 R39 CA → Certum Trusted Root CA → Certum Trusted Network CA
Certificate Authority Authorization (CAA)
CAA restricts issuance to certum.pl, letsencrypt.org; we couldn't map the serving CA (Asseco Data Systems S.A.) to one of these identifiers.
Never get surprised by esus-it.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch esus-it.com 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.
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