SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
basicstuff.org
SSL/TLS Certificate
SSL/TLS Certificate for basicstuff.org
Expired- Issued by (CA)
- Let's Encrypt
- Subject
- *.basicstuff.org
- Valid from
- Apr 22, 2024
- Valid until
- Jul 21, 2024 (expired 733 days ago)
- Public key
- RSA 2048-bit
- Serial
- 040C93EC56720B349D9E80CCDBD9A54AB21C
- SHA-256 fingerprint
- EF:86:8C:42:34:B6:DF:83:95:89:F1:2E:F3:E0:E3:93:D8:CB:6A:A2:D0:86:37:8E:3C:CD:D1:83:16:BE:18:4F
- Chain
- R3 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
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Uptime
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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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