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-sit.at
Valid- Issued by (CA)
- DigiCert Inc
- Subject
- *.a-sit.at
- Valid from
- Sep 10, 2025
- Valid until
- Sep 9, 2026 (47 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 06B444B7ECE421516C4C3A6855A327C6
- SHA-256 fingerprint
- E1:A5:FB:AE:53:D3:7E:D6:14:C6:E8:1E:51:C7:2B:FE:16:68:5E:6B:07:5C:39:1A:DF:DF:BD:11:68:89:42:EF
- Chain
- Thawte TLS RSA CA G1 → DigiCert Global Root G2
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by a-sit.at's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch a-sit.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.
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