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 as-st.de
Valid- Issued by (CA)
- Google Trust Services
- Subject
- as-st.de
- Valid from
- Oct 12, 2026
- Valid until
- Jan 10, 2027 (83 days remaining)
- Public key
- RSA 2048-bit
- Serial
- A3DA7C69EFD518ED117D62E59FCF05C2
- SHA-256 fingerprint
- BA:9D:71:82:08:C2:49:8F:76:73:25:B2:51:CB:4F:6E:43:02:BE:97:52:32:02:CA:A7:2E:19:02:7F:4F:64:DF
- Chain
- WR1 → GTS Root R1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by as-st.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch as-st.de 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, CNAME, TXT 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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