SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
npm-co.com
SSL/TLS Certificate
SSL/TLS Certificate for npm-co.com
Valid- Issued by (CA)
- Asseco Data Systems S.A.
- Subject
- npm-co.com
- Valid from
- Jun 6, 2026
- Valid until
- Dec 22, 2026 (110 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 46793495B132E317DE856B4128EDECEE
- SHA-256 fingerprint
- 21:4F:5B:26:12:A2:B9:56:4E:20:EA:5D:6E:49:73:E0:4C:42:8F:F2:62:A1:46:69:69:37:31:83:AA:F8:13:6F
- Chain
- Certum DV TLS G2 R39 CA → Certum Trusted Root CA → Certum Trusted Network CA
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Sep 2, 2026.
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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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