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 bas-u.se
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- bas-u.se
- Valid from
- Jul 17, 2026
- Valid until
- Oct 15, 2026 (76 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05131E3B791BCFFD1469A47ACA0FA8674305
- SHA-256 fingerprint
- E3:65:0B:B8:26:F3:F8:BB:2C:F5:F1:A4:6E:F0:60:77:42:7D:F2:91:DD:FF:2C:E9:84:DA:8C:0C:C6:6C:72:F4
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by bas-u.se's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch bas-u.se 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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