SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
door-guard.com
SSL/TLS Certificate
SSL/TLS Certificate for door-guard.com
Hostname mismatch- Issued by (CA)
- GlobalSign nv-sa
- Subject
- www.actionfastenersonline.com
- Valid from
- Jan 12, 2026
- Valid until
- Feb 13, 2027 (202 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 66E92028FEEE295232A0CF4E
- SHA-256 fingerprint
- 59:B1:42:44:2B:8C:F1:F4:10:08:AB:92:C1:C8:42:FF:E1:C8:70:F9:19:AD:39:40:B7:EC:84:71:BF:68:94:0C
- Chain
- GlobalSign GCC R6 AlphaSSL CA 2025 → GlobalSign
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 door-guard.com continuously, notifying you the moment anything moves across all three signals:
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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