SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
defmap.com
SSL/TLS Certificate
SSL/TLS Certificate for defmap.com
Expired- Issued by (CA)
- Let's Encrypt
- Subject
- defmap.com
- Valid from
- Nov 20, 2025
- Valid until
- Feb 18, 2026 (expired 256 days ago)
- Public key
- RSA 4096-bit
- Serial
- 051972C1067BAAE375465C36023CA3D857F5
- SHA-256 fingerprint
- D6:C3:2A:55:E7:01:7A:1C:93:7E:56:E9:98:86:47:69:F8:C3:12:3C:CF:F1:1D:A1:F0:5F:13:6C:96:A1:54:36
- Chain
- R12 → 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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This is today's certificate. Turn on monitoring and we'll watch defmap.com continuously, notifying you the moment anything moves across all three signals:
Uptime
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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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